Paraphrase toe following, using some of the patterns above: pattern 1: 1. it is not often that our mother goes to the theatre. 2. it is not often that our students can listen to native english speech. 3. she very seldom can afford to get herself a new dress. 4. they cannot afford to spend their holiday at the seaside. 5. he can never refuse helping his comrades. pattern 3: 1. it is bad manners to stare at people. 2. the teacher said it was impolite and rude to hand in homework written carelessly. 3. "i say, turner, i don't like the way you treat your comrades. it's too bad." 4. my mother said that it was too bad to let her do all the work alone. 5. it is wicked to hurt animals. 6. "you have come unprepared again. it is unpardonable, " said the teacher.

Can - могу, умею. Употребляется в треx временах: present Simple (саn + глагол без окончаний); Past Simple (could + глагол без окончаний ); Future Simple ( will be able to .. + глагол без окончаний). Есть еще его синоним, to be able to, который имеет значение могу, в состоянии уже что-то делать (после перелома, например, болезни, или время появилось). Синоним также в трёх часах: present Simple: Today I am able to run, my leg doesn't hurt. My friend has recovered, he is able to play football. We have free time today, we are able to go to the country. Past Simple: Yesterday my leg didn't hurt, I was able to run. My friend has recovered, he was able to play football yesterday. We had free time yesterday and we went to the country. Future Simple: will be able to .../ shall be able to ... My leg doesn't hurt and I'll be able to play ball tomorrow.

Объяснение:

1. You shouldn't eat so much fast food. - тебе не стоит есть так много фастфуда.

2. Jane shouldn't go outside tonight. She has a test tomorrow. - Джейн не стоит идти гулять этой ночью. Завтра у неё тест.

3. I should exercise more. It's good for me. - Мне стоит больше тренироваться. Это хорошо для меня.

4. Doctors say we should a lot of fruits. - Врачи говорят что нам стоит есть много фруктов.

(could - могли бы, в времени. Не используем could ибо оно не вписывается в предложение)

5. James shouldn't drive so fast. He may have an accident. - Джеймсу не стоит водить так быстро. Он может попасть в аварию.

(не используем can't ибо мы не запрещаем Джеймсу быстро водить, а лишь даём совет во избежании аварий).

6. He has a cold. He should stay at home. - У него простуда. Ему стоит остаться дома.

(для примера, если мы используем shouldn't, то звучать будет как "у него простуда, ему не следует оставаться дома". Поэтому shouldn't здесь не подходит)