Помогите пожалуйста . 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 SimpleThere will be a mistake in his test.Future SimpleThere has been  a mistake in his test.Present PerfectThere had been a mistake in his test.Past PerfectThere will have been a mistake in his test. Future PerfectНевозможно преобразовать данное предложение в present continuous, past continuous, future continuous