Grammatically Correct: The writer's essential guide to punctuation ...

GRAMMATICALLY CORRECT
also works with them and they, but not with her and she, since
there is nom in either of those words.) Thus: He is calling; I wish
to speak to him; we wanted to support him; she said he is her
masseur; he will win; they'll choose him; we figured they would be
interested; we figured the customers would believe them.
You can use the same strategy to determine whether a sentence
should take whoever or whomever. Thus,
Would whoever borrowed the karaoke machine please keep it.
[he borrowed it]
Whoever is responsible for this mess should clean it up.
[he is responsible]
Please return that hideous lamps hade to whomever you got it from.
[you got it from him]
Feel free to go sky-surfing with whomever you want.
[you want him]
In everyday speech, most people would probably say Who do you
think they'll choose? or Feel free to go sky-surfing with whoever
you want. Whether or not you make the subjective/objective distinction
in such cases should depend on the formality of your writing.
WHEN DO YOU USE THAT AND WHEN WHICH?
The issue here is how the information that follows the pronoun
relates to the subject of the sentence.
Use that when the dependent clause is providing identifying information
about the subject. For example: Spiders that live underground
do not spin webs. The subject of the sentence is spidersbut
not all spiders. The dependent clause that live underground
applies to only some species of spider, and hence is acting to further
identify the subject.
Use which when the clause is simply providing additional information
about a subject that is already fully identified. For example:
Spiders, which have eight legs, are not classified as insects.
Again, the subject is spiders, and in this case we mean all spiders.
The dependent clause which have eight legs applies to every species
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