Examples:

We go to the store.

They study at the university.

Use the present tense to describe something that is universally true and not limited to a particular time.

Example:

The boiling point of water is 100 degrees Celsius.

Use the present tense to discuss the contents of a book, a poem, or an essay even though the work might be written in the past.

Example:

Julius Caesar is murdered by Brutus in Shakespeare’s play.

The present continuous tense shows that something is happening in the present and will have a definite end.

Examples:

We are going to the store now.

They are studying at the university.

The past tense shows that something was completed in the past.

Examples:

We went to the store yesterday.

They studied at the university in 1980.

The past participle tense shows that something was completed in the past before another action. Usually, the past participle and the past tense are used in the same sentence.

Examples:

We had gone to the store when she arrived.

They had studied at the university before they found jobs.

The future tense shows that something will happen in the future.

Examples:

We will go to the store later today.

They will study at the university in the coming September.

Active Tenses:

Simple Present

Present Progressive

Simple Past

Past Progressive

Future

Present Perfect

Present Perfect Progressive

Past Perfect

Future Perfect

Passive Tenses:

Simple Present

Present Progressive

Simple Past

Past Progressive

Future

Present Perfect

Past Perfect

Future Perfect

Modals

These sites explain them and give examples.