is reading

was reading a book

is reading a book

reads a book

They finished their homework.

They will finish their homework.

They have finished their homework.

They are finishing their homework.

I have worked

I am working

I have been working

I will be working

What did you do yesterday?

I wake up at 10 PM and go to bed.

Person A: "What do you do in the morning?" Person B: "I wake up at 7 AM and eat breakfast. What about you?" Person A: "I usually go for a run before work."

I will eat breakfast at 8 AM.

jump

swim

run, eat, play

write

Subject + was/were + verb+ing

Subject + am/is/are + verb+ing

Subject + will be + verb+ing

Subject + have + verb+ing

will + base form

have/has + past participle

am/is + present participle

had + past participle

I will study for three hours.

I studied for three hours.

I am studying for three hours.

I have been studying for three hours.

The simple present indicates actions that are happening right now; the present continuous indicates actions that are always true.

The simple present indicates routine actions; the present continuous indicates ongoing actions.

The simple present describes future actions; the present continuous describes past actions.

The simple present is used for hypothetical situations; the present continuous is used for completed actions.

I am eating breakfast every morning.

I will eat breakfast every morning.

I ate breakfast every morning.

I eat breakfast every morning.

The present perfect tense is used only for past actions.

The present perfect tense is used to describe actions that have relevance to the present.

The present perfect tense is used exclusively in written language.

The present perfect tense is used to describe future events.

will

is

was

have/has

I run in the park.

I am running in the park.

I will run in the park.

I was running in the park.

have not/has not + present participle

did not + base form

have + past participle

have not/has not + past participle