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The English modal verbs are a subset of the English auxiliary verbs used mostly to express modality (properties such as possibility, obligation, etc.). They can be distinguished from other verbs by their defectiveness (they do not have participle or infinitive forms) and by their neutralization (that they do not take the ending -(e)s in the third-person singular).
The principal English modal verbs are can, could, may, might, shall, should, will, would, and must. Certain other verbs are sometimes, but not always, classed as modals; these include ought, had better, and (in certain uses) dare and need. Verbs which share only some of the characteristics of the principal modals are sometimes called "quasi-modals", "semi-modals", or "pseudo-modals".

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  1. VirtuosicVirtuoso

    Newly installed immersion heater suddenly stopped working after a week. What could be the issue?

    I've recently replaced an immersion heater for a direct cylinder, for 2.75-3kW. The new one seemed to be working a week before I got a callback. I checked the resistance of the immersion heater, and it read 19ohms, and the voltage on the live and neutral read 230V, but there was no humming or...
  2. F

    What could be causing this?

    Hi, would anyone like to hazard a guess at what's causing this problem on the ground floor of our house? As you can see, the bottom of both sides of the door frame are wet. The doorway is nowhere near any windows and is positioned pretty much in the centre of the house. Could this be water...
  3. L

    Could this be causing backfill and intermittent moisture in my walls?

    Hi I need some advice as this has been ongoing since august and nobody can find a problem but meantime water is damaging my walls. The lady upstairs had a plumber in July who relocated her washbasin shower and fitted a new radiator.He caused a bad leak and came to fix it in august and I thought...
  4. S

    No heating flow. Pump and diverter working, what else could be wrong?

    Hello all, I have a WorcesterBosch Greenstar 42CDi classic combi, which is providing DHW fine, but not heating. Was working fine in spring, probably not been used until recently now it's colder. When heating is called for, the boiler fires up ok but soon shuts down the heater as the...
  5. K

    What could be wrong with central heating?

    Hoping for some advice as I seem to be hitting a brick wall. Moved into a house last year, radiators down strairs (4 of them) never really got warm, replaced the combi boiler this year as it was loud and leaking (its in the loft which has been converted into a room). Since turning the heating...
  6. J

    Does anyone recognise this boiler?

    Anyone recognise this boiler How old could it be? Is it condensing? Ta muchpppl
  7. M

    Internal pipe leak - could dripping continue after water turned off?

    I have a growing damp patch on my ceiling, I initially assumed it must be from the empty flat above (and therefore cannot gain access), and have since used emergency cut off for that flat. I'm now wondering if it could a problem in my own flat, so cut a hole in the damp patch to investigate -...
  8. S

    Could this be my boiler's fault?

    Hi there, the water flow in our shower has reduced considerably since we bought our house, meaning the hot water tends to cut off after a minute or two; the shower is fed by a combi boiler: Worcester Bosch RD532i, about 17(!) years old I think. I can't really say if the water pressure in the...
  9. P

    What could be causing a noise in the house like a fog horn?

    Hi, We live in a bungalow. We are awaiting a plumber to check for water hammer but not sure if there are other things that may be causing the noises in our property. There is a booming noise about every 10 seconds followed by an echo. It starts at random times during the day and continues well...
  10. V

    dripping from over flow pipe have a heat genie could it be stuck open

    After power cut boiler over heated, since then water is dripping from the over flow pipe. I have a heat genie could it be stuck open or dirt causing a drip? How do I stop it ?
  11. G

    could this white material on radiator thread be/contain any asbestos?

    Hi everybody, I have noticed that unlike the other threads of the radiator which are sealed with something that really looks like hemp ("foto 1"), one of them has this white material wrapped around/inside the joint ("foto 2"). Could anybody tell me if it may be/could contain any asbestos? Many...
    • gigi22
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    • america asbestos could material radiator thread usa white
    • Replies: 3
    • Forum: USA
  12. Strebor

    What could be causing bubbles in heating after newly installed combi?

    This is a weird one, for sure... I had an old Vaillant combi replaced by a new Worcester Greenstar 4000 by Boxt. It was as simple a job as you can imagine - direct replacement... my house is a simple 2 up 2 down semi - nothing remotely complicated. However for the last two months since it was...
    • Strebor
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    • after america bubbles causing central heating system combi could heating installed newly usa
    • Replies: 14
    • Forum: USA
  13. FeePee

    Bent my TRV pin. It's not currently leaking, but could it come loose?

    Good morning! I've had no heat in my attic bedroom for over 2 years - the rest of the radiators worked fine, but this one was a dead duck. I watched some YouTube videos, and read through these forums, and decided to have a look at the TRV pin. Lo and behold it was stuck down! I managed to...
    • FeePee
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    • Replies: 2
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  14. cathydavies1994

    Boiler advice - could it be condemned?!

    Hello! I have a few questions regarding a boiler in my father-in-laws place that I'm very worried about and would like advice. My father-in-law is a chronic "tinkerer" and will fiddle and mess with things that didn't need tinkering with. He's recently told us that in the past he has moved pipes...
    • cathydavies1994
    • Thread
    • advice america boiler could usa
    • Replies: 6
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  15. N

    I could do with some advice re. ATAG boiler

    Turning here out of desperation. I have an ATAG A325EC boiler that's throwing errors like there's no tomorrow. I know that ATAG are meant to be good, well built machines but I'm losing all faith in mine. Started with Error 78 ('no pressure or pump failuire'). My normal heating engineer (not an...
    • Number96
    • Thread
    • advice america atag boiler could usa
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  16. L

    Could someone help me ID this flush?

    My house has consistently been plagued by leaky dual action cisterns since I bought it. The fact that the cisterns are firmly hidden away behind plasterboard walls with nothing but a small access hole where the faceplate of the cistern is located has never helped. I have finally taken the...
    • LostInTheFlush
    • Thread
    • america could flush help someone usa
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  17. L

    Could somebody tell me what this part is and how to fix it?

    The toilet flush button on our toilet has stopped working. We tried to fix it and a piece that the button screws into has come off and fallen down the pipe - the toilet will still flush using the internal mechanism but we can't get the button to work. I believe we may need to replace the filler...
  18. KarlAtkins

    What could be stopping heating working

    So I drained my Central heating system today just to remove 1 radiator in a room I'm decorating. When I refilled the system the central heating nor the hot water will work. I thought it was the motorised valve so I replaced that but to no avail, so the valve came with a new 3 way port so I...
    • KarlAtkins
    • Thread
    • america central heating system could heating usa working
    • Replies: 18
    • Forum: USA
  19. S

    Could anyone please help me source a particular toilet seat in the UK?

    Dear Community, Could anyone please help me source a particular toilet seat in the UK? Is there a UK supplier that specialises in toilet seats? Many thanks in advance for your help. The existing Valadares toilet (see 3 images attached for style of Valdares toilet I have). The measurements are...
    • Sean Curtis-Ward
    • Thread
    • america anyone could help please source toilet toilet seat usa
    • Replies: 6
    • Forum: USA
  20. jfelstead

    Could this be a Rat?! Whole in pan connector

    Woke this morning to see water pouring out the bottom of our downstairs loo. Took a closer look and found this large whole in the pan connector. Easy enough to replace - but what could have made this hole? Is a rat the most obvious answer? See picture!
    • jfelstead
    • Thread
    • america connector could pan pan connector usa whole
    • Replies: 3
    • Forum: USA
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