Поставитьв вопросительную и отрицательную форму.
1. machine parts can be produced by today’s machine tools with very high precision.
2. tools that cut metals should be made of very hard steel and alloys.
3. very often special buildings must be constructed for large machine tools.
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ответ:
1) i don't have to walk to school ( я не обязан ходить в школу пешком, потому что могу и на машине проехаться или маршруткой и т.п. если бы было go to school тогда да)
2) parents mustn't get up at 6 a.m. ( если они конечно не работают в ночную смену)
3) best friend don't have to leave home early.( мы же не в курсе что ему там сказали, может он и должен прийти раньше, если бы уточнили)
4) students mustn't eat in the classroom.( лично я так думаю конечно)
5) i don't have to learn spanish( ну может если тебе это необходимо тогда have to)
6) friends and i have to (should) help at home.( я б поставил конечно should)
7) mum have to drive to work. (тут от вас зависит. если работа далеко - тогда используйте have to, если же близко - don't have to)
8)we mustn't run in the corridors. (mustn't - потому что это правило, что нельзя бегать. хоть я и не придерживаюсь его))