What are the forms of infinitive?

The infinitive form of a verb is its most basic form. It is usually preceded by the word "to".

Here are the two forms of the infinitive:

1. Base Form: This is the simplest form of the infinitive, and it's the form you'll find in a dictionary.

* Example: *to sing*, *to eat*, *to run*

2. Perfect Infinitive: This form uses "to have" followed by the past participle of the verb. It is used to describe an action that happened before the main verb.

* Example: *to have sung*, *to have eaten*, *to have run*

Here are some examples of infinitives in sentences:

* I want to go to the beach. (base form)

* She is planning to have eaten dinner by 7:00. (perfect infinitive)

* We need to finish the project by Friday. (base form)

Note: There are some verbs that don't require "to" before the infinitive, such as "let", "make", "help", and "dare."

* Let me go.

* Make her eat her vegetables.

* Help me carry this box.

It's important to remember that these are just the basic forms of the infinitive. There are other variations, like the present participle (which can sometimes be used in place of the infinitive), but these two forms are the most common.