缺小品詞to
① 不定式充當各種成分，一般都不能缺少 to。如：
She went there ∧ (to) see her mother.
He asked me not ∧ (to) go there.
I have something important ∧ (to) tell you.
② make, let, have, see, hear, notice, observe, watch 等動詞變成被動語態(tài)時，充當主語補足語的不定式前的 to需還原。如：
She was made ∧ (to) do heavy work.
The blind man was seen ∧ (to) cross the street.
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