Which of the following sentences is/are incorrect? ("Permit" vs. "allow" vs. "let")

Question

Which of the following sentences is/are incorrect? Why?

• The visa permits you to study for two months.
• My father would never allow me to study English
• Let me to go. You're hurting me.

This is question from an English learning book. All the sentences seem right to me. Do you know which one is incorrect and why?

Answer 1

The incorrect sentence is:

Let me to go. You're hurting me.

It should be:

Let me go.

Let takes a bare infinitive (i.e. no "to"). The Oxford Advanced Learner's Dictionary has more details and examples.