Преобразуйте данные предложения в отрицательные. 1. he gave a dinner party yesterday. 2. the man in black shirt is our manager. 3. my friend began working when he was 17. 4. the table should be laid quickly. 5. look. our head-waiter is greeting the guests.
2.isn't
3.didn't begin
4.shouldn't
5.isn't