These two are sometimes confused.
Who’s is the short form of who is:
Doctors said last night Watson, 27, who’s suffering head injuries, was progressing slowly.
Whose is the possessive form of who and means ‘belonging to whom’:
Whose house was it, anyway?
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Relative clauses can be introduced by these relative pronouns:
Who/whom/whose which that.
The choice between who and whom can sometimes cause problems. The traditional rules are these:
Use who as the subject of the verb:
Any members who find themselves in the Adelaide area can be assured of a warm welcome there.
Use of whom as the object of the verb:
The God whom we worship.
Use whom after prepositions:
To whom have you complained?
These rules should still be followed in formal writing. Increasingly, however, who is replacing whom in speech and less formal writing.
For example:
They had to say who they supported.
Instead of
They had to say whom they supported.
And
Currently, most people won’t go and see a band who they haven’t heard of.
Instead of
Currently, most people won’t go and see a band of whom they haven’t heard.
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A subordinating conjunction used to introduce adverbial clauses of time:
Sue sat quietly and smiled while this was happening.
It also introduces adverbial clauses of concession:
But while this may well provide some help, it will not produce answers.
In the past the form whilst was also widely used. This is less common today.
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The main uses of where are:
Question word:
Where shall we go?
Relative pronoun:
It was not difficult to find the place where the prisoners were hiding.
Subordinating conjunction introducing an adverbial clause of place:
Put it where it gets as much sun as possible.
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The main uses of when are:
Question word:
When did you last see your father?
Relative word:
I cannot recall an occasion when he asked me for help before.
Subordinating conjunction introducing a noun clause:
I haven’t told them when I start.
Subordinating conjunction introducing an adverbial clause of time:
The off-season hotel had been empty when she arrived.
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