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The marker to is normally used before infinitives. Note that this to is not a preposition; after the preposition to we use –ing forms.
Infinitive as subject
An infinitive can be the subject of a sentence. This was fairly common in older English.
In modern English, this is unusual. We more often use it as a ‘preparatory subject’, and put the infinitive clause later.
Infinitive as object
Many verbs can be followed by an infinitive clause in the place of the direct object.
Infinitive clause as complement
An infinitive clause can be used after be as a subject complement.
To-infinitives can be used as the object or complement of a verb, adjective or noun.
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