He (can’t leave, couldn’t have left, couldn’t leave, needn’t leave), he is ill. you (must, have to, had to, has to, will have to) read this book. it’s really useful. the buses were all full. i (must, have to, had to, has to, will have to) get a taxi. ,выбрать правильный модальный глагол
2.must
3.had to