Написать предложение в этих формах : Present simple, Future simple, present continuous, past continuous, future continuous, present perfect, past perfect, future perfect. Вот предложение: There was a mistake in his test.

There is a mistake in his test. Present Simple

There will be a mistake in his test. Future Simple

There has been a mistake in his test. Present Perfect

There had been a mistake in his test. Past Perfect

There will have been a mistake in his test. Future Perfect

Невозможно преобразовать данное предложение в present continuous, past continuous, future continuous