Allow, permit or let?

We use a direct object + to-infinitive after permit and allow:

[from a newspaper report about a rugby player]

He has not decided yet whether his leg injury will permit him to play this weekend.

I would not allow a child to have a TV or a computer in their room.

We use an infinitive without to after let:

[child to parent]

Why don’t you let me go? All my friends are going.

We don’t let employees use the office telephone for personal calls.

We often use the passive with permit and allow. Permit is often used for official public notices:

Photography is permitted for non-commercial use only.

[talking about a diet]

You’re allowed to eat as much fruit as you like.

We’re not allowed to put posters on the walls.