I am slept

I have slept

I did slept

I do sleeping

I will slept

past simple of the verb

verb ending in -ing

verb ending in -ed

past participle form

base form of the verb

I have eaten pizza

I have ate pizza

I have eating pizza

I have eated pizza

I have eat pizza

when the subject is plural

when the subject is singular

when the subject is third person singular

when the subject is third person plural

Everybody has failed the Biology test

Brian and Sue has failed their Biology test

We has failed our Biology test

I has failed my Biology test

at the end of the verbal form

at the beginning of the verbal form

after the subject

after the auxiliary verb

I not have slept at all

I have slept not at all

I have not slept at all

I have slept at all not

change the position of subject and verb in the affirmative sentence

change the position of subject and auxiliary in the affirmative sentence

we add a question mark to the end of the sentence

we change the position of the auxiliary and the verb

Have you turned on the oven?

Have turned you on the oven?

You have turned on the oven?

Turned have you on the oven?

just, already, yet

ago, in the past, yesterday

since, for, ever

so far, till now, up to now

currently, nowadays, now

Tina has arrived home since a minute

Tina has just arrived home

Tina has arrived home yet

Tina has arrived home for a minute

Have you just gone climbing?

Have you yet gone climbing ?

Have you ever gone climbing?

yet

since

for

ever

already

a period of time in the past

a point in time in the past up to the present

a period of time up to the present

a very recent action

a period of time in the past

a point in time in the future

a period of time up to the present

a very recent action

I have lived in this house since I was a child

I have lived in this house for twenty years

I have lived in this house since twenty years

I have lived in this house for I was a child

before the main verb

after the subject

at the end of the sentence

between the subject and the verbal form

past experiences

the things you have done in your life

past actions with a present result

repetitive actions

actions in the past up to now

Barbra has waited at the dentist's an hour ago

Barbra has waited at the dentist's now

Barbra has waited at the dentist's for an hour

Barbra has often waited at the dentist's

he never voted in the elections

he has never voted in the elections

he had never voted in the elections

he is voting in the elections

it rains a lot.

it rained

it is raining

it has rained.