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Which and that are normally used with non-human antecedents.

When and where are used for times and places.

Whose is for professions, for human and non-human antecedents.

e.g. Often companies whose products don't meet customers' requirements lose

their share of market, (identifying)

They used a stolen Mercedes whose owner has not yet been found, (non-

identifying)

That is used instead of which after superlatives, only, every, no, etc.

e.g. It was the longest film that had ever been made. The only thing that matters is.

Contact clauses:
In identifying clauses only, the relative pronoun is omitted with object antecedents.

e.g. That's the man I was telling you about.

e.g. Which can also be left out.

e.g. This is the room you'll be working in.

The position of prepositions:
In informal English prepositions tend to come at the end of the clause. e.g. He is

the one I voted for. (identifying)

Anyway, I found out that the picture, which I'd already paid for, was

stolen.(non-identifying)

In formal English prepositions tend to come at the beginning of the clause.

e.g. The employee to whom you refer has now left the company, (identifying)

The new deal, under which wage rises are linked to productivity, has been accepted
by the union, (non-identifying)

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