Change to the Past.

by Sunil
(new delhi ,delhi, india)

Practical English Usage by Michael Swan

Practical English Usage by Michael Swan

I received the following sentences and from the title I am going to assume that Sunil wants me to put them into the past.

We mustn't take our jackets off.
Must does not have a past tense form so I used should.
We should not have taken our jackets off.

I can't understand every word.
I couldn't understand every word.

We must leave early.
We had to leave early.

We're allowed to invite who we want to.
We were not allowed to invite who we wanted to.

I don't have to go to work.
I didn't have to go to work.

How did I know that "must" does not have a past form? I looked it up in "Practical English Usage".

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