13. Write the following sentences in the negative. a) 1. He checks and adjusts the brakes regularly, 2. They often apply these ideas in practice. 3. She really likes her choice of jewellery. b) 1. Bob chose to learn German rather than French. 2. He practised his painting techniques on unwanted pieces of wallpaper. 3. We needed to take drastic steps to protect the environment. 4. I went to the bank this morning. 5. Jack did English at college. 6. I watched television yesterday. c) 1. This course will help students develop their speaking skills. 2. The weather will be much warmer in the next few years. 3. She will teach the English language at our college. 4. The use of computers technology will spread into all fields of work. 5. You will expand your vocabulary through reading. 6. All the flats in the building will have the same layout.

Вот подробное решение с пошаговым объяснением и готовым ответом на задачу. Как образованы отрицательные формы в этих предложениях - Для настоящего простого времени (present simple) у основного глагола в 3-м лице ед. ч. добавляют вспомогательный did + отрицание: не + базовая форма глагола. Обычно это записывают как does not + базовая форма глагола (или сокращение doesn't). - Для прошедшего времени (past simple) используется did not (didn’t) + базовая форма глагола. - Для будущего времени с will: will not (или won't) + базовая форма глагола. а) Переводим в отрицательную форму предложения в Present Simple/Present Continuous по контексту (здесь простое настоящее) 1) He checks and adjusts the brakes regularly. - He does not check or adjust the brakes regularly. (или He doesn't check or adjust the brakes regularly.) 2) They often apply these ideas in practice. - They do not often apply these ideas in practice. (или They don't often apply these ideas in practice.) 3) She really likes her choice of jewellery. - She does not really like her choice of jewellery. (или She doesn't really like her choice of jewellery.) б) Прошедшее время (Past Simple) 1) Bob chose to learn German rather than French. - Bob did not choose to learn German rather than French. (или Bob didn't choose to learn German rather than French.) 2) He practised his painting techniques on unwanted pieces of wallpaper. - He did not practise his painting techniques on unwanted pieces of wallpaper. (или He didn't practise his painting techniques on unwanted pieces of wallpaper.) 3) We needed to take drastic steps to protect the environment. - We did not need to take drastic steps to protect the environment. (или We didn't need to take drastic steps to protect the environment.) 4) I went to the bank this morning. - I did not go to the bank this morning. (или I didn't go to the bank this morning.) 5) Jack did English at college. - Jack did not do English at college. (или Jack didn't do English at college.) 6) I watched television yesterday. - I did not watch television yesterday. (или I didn't watch television yesterday.) в) Будущее время с will 1) This course will help students develop their speaking skills. - This course will not help students develop their speaking skills. (или This course won’t help students develop their speaking skills.) 2) The weather will be much warmer in the next few years. - The weather will not be much warmer in the next few years. (или The weather won't be much warmer in the next few years.) 3) She will teach the English language at our college. - She will not teach the English language at our college. (или She won't teach the English language at our college.) 4) The use of computers technology will spread into all fields of work. - The use of computers technology will not spread into all fields of work. (или The use of computers technology won’t spread into all fields of work.) 5) You will expand your vocabulary through reading. - You will not expand your vocabulary through reading. (или You won’t expand your vocabulary through reading.) 6) All the flats in the building will have the same layout. - All the flats in the building will not have the same layout. (или All the flats in the building won’t have the same layout.) Если хочешь, могу привести альтернативные варианты с сокращениями (don't/doesn't/won't) или разобрать любые сомнения по конкретным предложениям.