Исправьте ошибки.
You don't have to say that. It's not polite.
He will not have to writes the test.
He must bring the map yesterday.
He will be able walk in a month.

Вот так будет правильным

You don't have to say that. It's not polite.

He will not have to write the test.

He had to bring the map yesterday.

He will be able  to walk in a month.

Объяснение:

You mustn't say that. It's not polite. He will not have to write the test. He had to bring the map yesterday. He will be able to walk in a month