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English grammar tips with Gymglish, online English lessons.
To introduce a subordinate with the words 'who', 'what', 'which', 'where'...:
WHO / WHOSE / WHOM refers to people and sometimes animals (who, that, which):
Our C.E.O., whose father was a dentist, has a nice smile.
My sister Michelle, whom you met last Saturday, has been married twice already.
WHAT and WHICH refer to things or ideas:
The chalet, which I told you about last week, is not for sale anymore.
The iceberg was what impressed me most.
She doesn't know what to do.
Note: WHICH can also refer to people, when a choice is being introduced:
WHERE and WHEN respectively introduce a notion of place ('where') and time ('when'):
So this is what it sounds like when doves cry. (Prince song)
THAT can refer to a thing or a person. It can even be left out and the meaning can be inferred:
The dress (that) she is wearing is a nice color.
The man (that) we saw is my boss.
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