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Prepositions and postpositions, together called adpositions (or broadly, in English, simply prepositions), are a class of words used to express spatial or temporal relations (in, under, towards, before) or mark various semantic roles (of, for).A preposition or postposition typically combines with a noun phrase, this being called its complement, or sometimes object. A preposition comes before its complement; a postposition comes after its complement. English generally has prepositions rather than postpositions – words such as in, under and of precede their objects, such as in England, under the table, of Jane – although there are a few exceptions including "ago" and "notwithstanding", as in "three days ago" and "financial limitations notwithstanding". Some languages that use a different word order have postpositions instead, or have both types. The phrase formed by a preposition or postposition together with its complement is called a prepositional phrase (or postpositional phrase, adpositional phrase, etc.) – such phrases usually play an adverbial role in a sentence.
A less common type of adposition is the circumposition, which consists of two parts that appear on each side of the complement. Other terms sometimes used for particular types of adposition include ambiposition, inposition and interposition. Some linguists use the word preposition in place of adposition regardless of the applicable word order.

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  1. 2

    Rad not heating up. Warm water through both valves.

    I have a house with 15 rads in it. In a bedroom upstairs I have a rad that isn't heating up. This rad was moved about 5 years ago with 1/2inch plastic pipe to new location in the same room but was never turned on. Tonight I tried to blead it but then removed the rad, emptied it and when off...
  2. R

    Help... no gas coming through meter or regulator

    My daughter has just moved into her first rental house with gas stove and hot water in Melbourne. The meter (pictured) definitely has gas connected to the regulator. But gas is not getting to the stove or water heater. The previous tenant had turned the gas tap off at the meter but it's on now...
  3. E

    Anybody drilled through a floor with UFH before?

    Looking to install a kitchen island with integral sink, this will mean installing drainage and plumbing. But will need to dig a hole through UFH, has anybody done this before?
  4. O

    Central heating pressure is discharging through condensate trap.

    Hi everyone, my sister's 5 year old Worcester Greenstar CDi Classic boiler is losing pressure rapidly[down from 1.5bar to zero overnight]. I checked everything I can think of including all visible pipework, radiators and pressure relief valve outlet and couldn't find a thing out of the ordinary...
  5. P

    Chasing radiator pipes through joist and wall

    Hi all, hoping there are answers out there to my small dilemma. A customer of mine wants 15mm radiator flow and return pipes chased into the block wall and pop out down the bottom. Problem is the joists are close to the wall so to start the chase in the block i will have to notch out the joist...
  6. F

    Shower Waste through concrete floors - any advice ?

    Hi everyone, First a quick bit of background : I'm English, living in France, and renovating a 1960s house, which has pretty much needed to be stripped back to the studs, and started again. Full new electrical refit, plumbing refit, walls, ceilings &etc. It took about a year-and-a-half (as...
  7. Bogart

    Flow rates through 2 and 3 port valves.

    Yes it me again with another question. I keep reading that one will get a better flow rate in an S plan than in a Y plan. Now I can see that being valid if both heating and hot water are called for but if only one surely the flow rate will be the same for both plans? Finally are there any makes...
  8. eli-nathan

    Saniflo motor runs through the night

    Recently moved in to a flat and we have a Saniflo toilet in the ensuite. For a while it was okay but then it started running occasionally without being used. It has started running every hour or so through the night and it makes a huge noise so we just switched it off. After turning it off...
  9. R

    New flue letting water in through middle.

    Just had a massive downpour and seems the inner tube of the vertical flue lets water in . The boiler is not connected as the plumber is doing that next week but I have put the flue through the roof hence noticing it . It's a condensing flue for oil system. It is new and water is only coming...
  10. W

    Salamander pump - no cold water being pumped through

    Hi, I've just moved into a house that has an immersion tank and a Salamander pump above it for the showers. It started leaking after a week and the shower went really hot so we called someone out who replaced an O ring, which stopped the leak, but it's still coming out too hot. I've just checked...
  11. C

    AT RISK WATER MAIN EARTH BONDING THROUGH METER BOX BACK PLATE

    Could someone take a look at this for me please? Just had a boiler put in our property on a grant scheme. The boiler is great other than him not cleaning the pipework including gas joints before leaving 🙁. I've cleaned it up and it seems alright. My other main worry though was what the follow...
  12. D

    mains water pipe be run through an integral garage?

    Can a mains water pipe be run through an integral garage? It's to feed a washing machine used 2-3 times a week. Is there a risk of the pipes freezing?
  13. B

    Boiler 'no flame' cutout with sensible current through flame sensor.

    Hi. I have a Chaffoteaux HE 30 which keeps locking out with errors of (mostly) no flame (E04) or (occasionally) flame lift (E18). During the startup cycle a flame is visibly present, and the current through the flame sensor is about 5 - 8 microamps (see pic) until it locks out. Should that not...
  14. N

    Flues through timber frame building

    Hi I’ve got my ACS exams in 2 weeks and am working a few days a week with a registered gas engineer. Today I was given the task of doing the flue for a Glow Worm boiler. This is a new build and is timber frame, I’d heard before that through a timber frame wall the flue needs a sleeve, the...
  15. D

    Vibration in floor....felt through out flat.

    #Rachiex put a post up which ended in 2017 concerning a vibration throughout the flat waking him/her up between 11 pm and 4 am - this is happening to me. it is felt during the wintertime both in 2019/20 and in 2020/21. as the warmer days have come in I am not feeling it. neighbour above has a...
  16. JLS

    Mains Inlet through loft

    Was asked to look at a Mains inlet today that the property owner wants moving. It currently comes into the hall in black HDPE , through a concrete slab and about 6 inches up the wall in copper, then poly up the wall and through the unheated loft space. It's not pretty, but at least whoever...
  17. S

    Bringing pipework through ensuite floor

    When bringing pipework through the floor of the ensuite, I wonder just how tight I need to make the fit between the floor and the pipework? I have seen a previous comment about getting the fit as tight as possible, but I’m not sure why that is necessary? Reason I ask is that it will be a PITA...
  18. PhilCSwift

    Best way to lay rad pipes through a wide chimney breast

    It's an old nunnery with massive breasts! 3 floors and basement. Chimney had 6 fireplaces feeding it. As I am 1st floor (English)/2nd floor (USA) I have a wide breast with 2 blocked off fireplaces. The firepace flues from below run up through and into the flat above and on through the loft to...
  19. P

    Riello HT lead burnt through

    Has anyone come across this before. Lead from the electrode on Firebird Combi. 2 years old. Riello 2.2 burner. If so any any ideas re Cause? possibly looks like it has been touching the oil line nut. But sheathing should protect it Thanks
  20. I

    Is commercial plumbing a good move for a level 2 plumbing & heating diploma trained adult going through a career change?

    I am currently going through a career change to be a plumbing and heating engineer. I have completed a year long plumbing and heating diploma level 2 at college and have signed up with a assessor at the college. It has been hard to find a placement as most plumbers either don't want the...
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