Because infinitives generally do not have explicit subjects the way other, main verbs do, users of English must infer the logical, or understood, subject of an infinitive in accordance with certain ...

The passive with modals, future and infinitive forms This is an example of a passive form. We use the passive when it is not so important to know who the agent of the action is.

The idea of split infinitives, largely taught during the mid-20th century, can harm the clarity of sentences — and is mistaken about what an infinitive is in the first place.

'Let' takes an infinitive without to, and 'allow' takes an infinitive with to. Both can be made negative with an auxiliary verb, and allow is often used in the passive form.