Question

Which sentence contains an infinitive or infinitive phrase?

A. Grocery shopping took forever this morning.
B. The squirrel is running up the tree away from the dog.
C. Can I take your car to the movies?
D. The letters to send are in the folder.

Answer 1

Infinitive and infinitive phrases begin with the word to + a verb. So having this in mind, the correct answer is D. The letters to send are in the folder, where the infinitive phrase is to send.
The other sentences do not have infinitives or infinitive phrases.