Negative sentence using ALLOWED TO (PRESENT SIMPLE)

Subject

Verb to be

Not + Complement

I

You

He/She/It

We/you/they

am

are

is

are

not allowed to buy the tickets

Negative sentence using ALLOWED TO (PAST SIMPLE)

Subject

Verb to be

Not + Complement

I

You

He/She/It

We/you/they

was

were

was

were

not allowed to buy the tickets

Affirmative sentences using MUST OR HAVE TO (PRESENT SIMPLE)

Subject

Epression

Complement

I

You

He/She/It

We/you/they

must/have to

must/have to

must/has to

must/have to

do homework

Affirmative sentence using HAD TO (PAST SIMPLE)

Subject

Expression

Complement

I

You

He/She/It

We/you/they

had to

do homework

Negative sentences using MUST (PRESENT SIMPLE)

Subject

Expression

Not + Complement

I

You

He/She/It

We/you/they

must

not smoke here

Negative sentences using HAVE TO (PRESENT SIMPLE)

Subject

DO NOT

Expression

Complement

I

You

He/She/It

We/you/they

don't

don't

doesn't

don't

have to

smoke here.