What I want is to swim. (正确)
What I want is some food . (正确)
What I want is 的表语是名词或不定式,都正确。
What I want to do is (to) swim.(正确)
What I want to do is 的表语只能是表动作的不定式,不能是纯名词。
What you are afraid of is swimming. (正确)
What you are afraid of doing is (to) swim. (正确)
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