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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. B

    How long should I have my hot water coming on a day?

    I guess it all depends on the number of people living in a property and whether you have a shower everyday etc. But what's the recommended time I should have my hot water coming on a day. My local plumber stated an hour in the morning and an hour in the evening - seems excessive to me. Any thoughts?
  2. parakeet

    One radiator won't turn off - should I replace valve?

    My kitchen radiator is filling with hot water despite my TRV being set to 0. It's blazing at maximum. This goes for the rad when I try two separate TRVs I have tried, which happen to be... Basic programmable Bluetooth one that uses a motorised push-pin. Old basic TRV with settings 0-5. On...
  3. J

    Vent pipe - how and where should it be positioned

    Hi, I would be grateful for any advice regarding regulations on installing vent pipe. My landlord has recently hired a handy man who installed a vent pipe for him but he installed it in a way that is it placed on the outside wall, only 50cm under our window (1st floor window). It feels to me...
  4. FrugalShaun

    Should I replace my conventional boiler?

    I'm sure this is an old question but here goes. I'm looking for some advice regarding switching from a conventional boiler to a combi. I moved into my current house about a year ago. It has a conventional boiler with a hot water tank. The boiler is Vitodens 100-W, which is a condenser boiler...
  5. A

    What height should a AAV be under bath?

    I'm installing a new bathroom. I have a combined drain for the bath and shower (2 x 40mm >> 50mm >> stack) and have a McAlpine VP2 AAV to fit under the bath to avoid syphoning of the shower trap. Is this type of AAV correct and how high does it have to be above the bath/shower traps? Thank you.
  6. P

    Should there be water in trap?

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  7. Be kind

    Should a weather collar be stuck to stop rain leaking in?

  8. Be kind

    Should a gas engineer make good the holes he left before leaving?

    Had carbon monoxide leak from boiler flue. Gas engineer came to fit new flue. But left gaping holes in wall. Daylight was seen
  9. brendawest

    Should i call the plumber?

    How can you fix a clogged pipe that is half way inside the wall? Should i call the plumber?
  10. R

    Can this leak have sealed itself and should I leave it alone?

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  11. gb17342

    Should I replace this radiator pipe?

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  12. A

    What instant water heater should I get?

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  13. Kerberos

    How high should a concealed cistern be?

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    • Kerberos
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    • america cistern concealed concealed cistern height high should toilet pan usa
    • Replies: 5
    • Forum: USA
  14. B

    Combi vs tank - which should I go for?

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  15. R

    Should removal of old system boiler be complete inc tanks?

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  16. A

    Should i use Ptfe tape?

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    • Andrew74
    • Thread
    • america ptfe should tape usa
    • Replies: 6
    • Forum: USA
  17. S

    Should a water arrestor be banging?

    Hi, I had a problem with water hammer where the pipes in my house would bang every time I turned a tap off quickly. I called a plumber and he advised fitting a water arrestor, which I'd heard about after looking the problem up online, so I agreed and had one fitted. The banging sound has gone...
    • Samtheman
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    • Replies: 4
    • Forum: USA
  18. J

    frost stat - how long should it run for?

    Just checking my understanding of frost stats.. My customer has a boiler in a garage (12year old Vaillant/British Gas boiler on an unvented system), with an external frost stat wired in (not a pipe stat, but a 'room stat' from 0 to 10c). If the ambient temperature drops below the set point...
  19. D

    How long should I be heating my unvented cylinder

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  20. C

    What expansion vessel should i order for Boiler

    Hi, Currently have a Potterton Promax Combi 28 HE A boiler and looking to replace expansion vessel due to issues with it. Looking to make sure i get the right part for it Found this part online but it says it will Fit a Promax Combi 28 HE Plus A,Is the HE plus A and my boiler HE A the same...
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