In which of the following contexts is the English infinitive used without its word-morpheme "to" (the bare infinitive)?

Question

In which of the following contexts is the English infinitive used  without  its word-morpheme "to" (the bare infinitive)?

Answer

After verbs of mental perception, such as  to think  and  to know .

Answer

When used as the subject of a sentence, such as  To land seemed impossible .

Answer

After all modal verbs, including  ought  and  have .

Answer

After verbs of physical perception ( to see, to hear, to watch ),  to make , and  to let .

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