Practice Makes Perfect: Exploring Grammar - Muschla Gary Robert 2010

Verb Tenses
Verbs

The tense of a verb shows time. Tense shows when something in a sentence happens, happened, or will happen. The three main tenses of verbs follow.

✵ The present tense shows action that is happening now.

Christy and her brother walk their dog.

✵ The past tense shows action that has happened.

They walked their dog yesterday.

✵ The future tense shows action that will happen. It is formed by adding the helping verbs will or shall to the present-tense form of the verb.

They will walk their dog tonight.