I. закончи разделительные вопросы.1. they laughed a lot yesterday, . he is sometimes late, . mary can sing songs very well, . there are no pencils on the desk, . he knows english well,

1. They laughed a lot yesterday, didn't they?
2. He is sometimes late, isn't he?
3. Mary can sing songs very well, can't she?
4. There are no pencils on the desk, are there?
5. He knows English well, doesn't he ?