's standing for "is" - The church's at the top of the hill. 's standing for "of" or "of the"(possession) The church's steeple is in a dangerous condition. (The steeple of the church) Try this game for more examples
These days when bad English is visible everywhere on signs, on the web and in the press, here is some help with simple grammar rules for UK English.
the picture fell off the wall
the island is off the coast of Cornwall
to start off
to finish off
to give someone the brush off = to snub or disregard someone especially in boy/girl relationships
to knock off = to steal ( as well as the usual meaning)
off the wall = crazily unusual
push off! = go away (not rude)
a one-off = one of a kind (I've never understood why it is not a one "of"!)
a round of golf
he rounded off the evening with a
a piece of cake
he knocked a piece off the statue
xxxx Jimmy Carr rounds of the present series. xxxx
thunder and lightninga bolt of lightninga lightning strikehe runs like lightning
the sky is lighteninglightening the load