1. I don't know who to hire.
2. I don't know whom to hire.
3. I don't know who I should hire.
4. I don't know whom I should hire.
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Are they all grammatical? Do we have to use 'who' or 'whom'? Which one is commonly used?
5. I don't know why to do that.
6. I don't know why I should do that.
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Is #5 correct? I think #6 is right.
1 answer
Whom is the objective form, so since the person you will hire is WHOM you don't know, "whom" is correct. #6 is better than #5.
2 answers