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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. F

    Additional PRV

    Hi there, just looking for a bit of confirmation. I've got a Combi with a PRV letting by. It's not the easiest position to replace so I'm thinking I'll just add an additional one on the PRV pipe work. Apart from making sure that it's set to the same max pressure is the one inside the boiler I...
  2. M

    Mystery Tap Won't Stop Dripping

    Hi everyone, and apologies for such a basic question, but my bathroom hot tap is dripping and what is obviously a fairly easy fix (change of washers) has become a complete nightmare because I cannot find any of the washers I need to match to the existing in any shop - nor a single image of my...
  3. D

    Slotted pop-up 'click clack' waste won't stay down

    There seems to be a lot online about how unreliable these sprung loaded mechanisms are. I've one of these and it's refusing to click down. I'm not a plumber but I've got it out in the hope of repairing it. The screw just seems to hold in the moving part and tightening it doesn't seem to make...
  4. U

    Driveway drain blocked

    Hi everyone, I've got a small drain on my driveway it almost looks like a soakaway but it won't clear I've already managed to get my hand down and clear what I can it was full of dark thick sludge and I put some water down and soda crystals which at first looked like it cleared but after...
  5. S

    Two Bedroom Rads won't work - Scratcher

    Winter 2015-6 : Two upstairs Bedroom radiators are not working. Radiator 1 - had been switched off for couple of years because it hissed. Slight but constant noise. Fault became apparent because Radiator 2 became half hot recently. All summer the system had...
  6. M

    Running washing machine waste - long "trap"

    I have some routing issues with my grey waste - I have to get over or under another appliance. I don't want to go up, as the washer will back-fill. I was wondering about the possibility of installing the usual pipe down to floor level (for reasons I won't go into I can run a 40mm pipe along...
  7. K

    Boiler won't switch on

    Hi. I have a Worcester combi boiler that won't switch on. I tried to install a new thermostat but couldn't get it to work. Ever since then I seem to have no power to the boiler. I think I may have shorted something and blown it up. The main fuse in the circuit breaker is ok. Are there any other...
  8. R

    Pilot light won't stay on. Ideal E-Type boiler... Very old

    Hi, We have a rather old boiler 'Ideal E Type'. It's been good to us since we bought the house 8 years ago. This evening the pilot light went out and won't stay back on. We've tried several times, holding down the gas for 3-4 minutes at a time and nothing?! We've just sold the house and are...
  9. S

    Triton shower water flow won't stop

    Recently had an issue with a Triton Cara electric shower no water flow: Tested solenoid coil - open line so replaced coil now water won't shut off even though power is off at the main isolator. Tested switch all ok. When turned off i have no voltage to the solenoid coil. When turned on i have...
  10. J

    Central heating won't hear radiators?

    PLUMBERS PLEASE HELP (central heating)? Hello, this is the problem: My mum's heating stopped working (oil heating) as there was no heat going to the radiators. I messed it up more by going to the out side boiler and on the EDGB TF 830B box attached to the boiler, I held the button in and...
  11. U

    ballpark costs

    Hello All I've popped on just to see if anyone can help guide with costs and an invoice I've just received for works recently done. This wasn't quoted as the engineer in question has done some work for us before and this job, although not an emergency, was done in haste. Telephone call...
  12. D

    2 rads won't heat up!!

    New boiler fitted all other rads down stairs heating up 2 bedroom ones on 10mm pipe won't heat up changed the valves and balanced still stone cold hot in the corner of but nothing else doing my head in I've flushed them out with a hose at a loss now
  13. W

    Central heating problem

    Hello folks I have a oil fired boiler with a header tank system. I recently changed my pump on my heating system because the previous one was just not powerful enough, the new pump is a grundfos ups2 15-60 Since I changed it my radiators won't get warm at all I've bled the rads and turned...
  14. P

    Bleed Valve Keys Won't Fit On Older Rads (Inc. Pictures)

    Just a quick one. I have two different bleed keys (see photo), and neither will fit on the bleed valves of some older rads. I'm not 100 per cent sure, but I think they may fit on the square screw that turns, but it's the circular collar around the screw that's stopping the key sliding over the...
  15. T

    Replacement soft close seat on close coupled toilet - seat won't stay up

    Hi I'm new - let me know if I do anything wrong :) I'm replacing a soft close toilet seat on a close coupled toilet but the seat won't stay up . I think it maybe because the cistern will not let the seat open far entought ( + 90 degrees). I seat I tried to fit was one from screwfix a make...
  16. C

    Danfoss TP9000 won't turn off

    Hi, can anyone help please? My Danfoss TP9000 has randomly started ignoring all settings/programming and won't turn itself off at the right times...or at all in fact. HW seems to be working OK but CH stays on 24/7 despite only being set to be on 7am-10pm. I've tried resetting the controls and...
  17. S

    No blockage but WC won't flush!

    I very much hope someone can explain what's happening here? New'ish build 2/3 years old on three floors. 2nd floor On-suite WC/shower/sinks all flush away OK. 1st floor bathroom bath/WC/sink all flush away OK. Ground floor under stairs WC, the bowl just fills up although the sink empties OK. The...
  18. B

    Central heating circuit won't circulate after replacing radiator

    Hi - I'm a new poster and have just stumbled upon this very useful forum. I would be very grateful for any advice. I have a Eurocombi Ariston boiler that's about 10 years old. It operates without a thermostat on a simple on/off control within the boiler itself. There are five radiators...
  19. T

    Central heating on for the first time since spring, won't turn off again

    Hi all, We turned our heating on yesterday for the first time in a few months, and now it won't turn off again. It was turned on at the timer/control panel, but when it was turned off again at the panel, the boiler kept going and the radiators were still being fed hot water. (Hot water control...
  20. D

    Worcester Danesmoor 15/19 air setting won't go high enough!

    Manual States it should approximately be 9 but 7 is the highest the needle will go to? The screw just jumps at around 7. Any ideas?
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