What verb form is used for a present continuos action?

The verb form used for a present continuous action is the present participle.

This is formed by adding -ing to the base form of the verb.

Here's an example:

* Base form: walk

* Present participle: walking

The present continuous tense is formed by combining the present tense of the verb "to be" (am, is, are) with the present participle.

Here are some examples:

* I am walking.

* She is singing.

* They are playing.