Sentence Correction

Hi,

pls help in making me understand when to use which..... i had read somewhere that "avoid the ans having the word which in SC".

Pls tell when use of which is necessary and when to avoid it.

thanks a tonne.

Cheers.

first of all WHICH always has to be preceeded by a ','........

like he plays a game, which requires lot of effort.........

any option in which the word "which" is not preceeded by a ',' it is wrong...

2ndly..... just before the word which....the thing mentioned should be related to which.....
for example.... in my above example.... which is referring the game....so game is just before the wrd......which........

i hope this helps...........