Нужно сегодня определите в каждом предложении временную форму глагола-сказуемого they wrote the letter yesterday morning. i was writing the book at 8 o’clock. they are doing their laboratory work. he has arrested the thief and put him into prison. he had done his work by her arrival.

They wrote the letter yesterday morning. Past Simple Tense

I was writing the book at 8 o’clock. Past Continuous Tense

They are doing their laboratory work. Present Continuous Tense

He has arrested the thief and put him into prison. Present Perfect Tense

He had done his work by her arrival. Past Perfect Tense.