Напишите следующие предложения в вопросительной и отрицательной формах: 1) there is someone at the door. 2) you left something on the hall table. 3) he will bring someone with him. 4) there is somebody in the next room. 5) he has something important to say to you. 6) there is something wrong with this telephone. 7) she gave us something to eat. 8) he spoke to somebody about it.

1) there isn't someone at the door. is there  someone at the door?   2) you don't leftsomething on the hall table. do you  left something on the hall table?     3) he won't bring someone  withhim.  will he bring someone  with him?   4) there isn't somebody in the next room.  is there  somebody in the next room?   5) he hasn't something important tosay to you.  has he something important to say to you?   6) there isn't something wrong withthis telephone.  is there  something wrong with this telephone?   7) she doesn't  gave us something to eat.  does she  gave us something to eat?   8) he doesn't  spoke to somebody about it.  does he  spoke to somebody about it?

I've known him for three years

Our parents didn't trust doctors(-)

Helen had an idea(+)

Helen didn't have an idea(-)

It has rained a lot this month (+)

It hasn't (has not) rained a lot this month(-)

I have had them for five years(+)

I haven't had them for five years (-)

Объяснение:

Формула Present Perfect = действующее лицо+ has/have+ глагол третьей формы V3:

действующее лицо( местоимение, существительное) + has(при he/she/it, если стоит имя, например, Sarah( Сара-имя девушки= she=она=значит нужно использовать has) , в остальных случаях have (I have..., they have..., you have...) + глагол в третьей форме V3.

Отрицательные предложения в Present Perfect= все тоже самое, только во втором пункте формулы меняем на hasn't либо haven't в зависимости от действующего лица.

Формула Past Simple= действующее лицо+ глагол во второй форме V2

Our parents(д.л.) trusted(глагол в V2) doctors

Чтобы составить отрицательное предложение в паст симл нужно учитывать это:

В предложениях с минусом(отрицательные предложения) не имеет значения he/she/it или I/you/them и так далее, всегда будет для всех действующих лиц = didn't( did not), после которого идет глагол в инфинитиве.  И если глаголом был had, то в отрицательном предложении в Past Simple используем не hadn't, а didn't have.

Пример: сначала составляешь данное предложение в Past Simple с плюсом: Our parents (действующее лицо родители, множественное число, но в паст симл это не имеет значения) trusted( глагол V2) (доверяют) doctors. Потом забираешь у глагола trusted окончание ed,которое указывает на , и ставим перед ним didn't.

Получается: Our parents didn't trust   doctors.( теперь глагол стоит в инфинитиве, и так как did not уже указывает на , второе указание на ( если бы мы поставили trustED) не нужно.

3. He's looking for his key at the moment.

4. It's snowing now.

5. Quiet! Alice is sleeping now and you're making a lot of noise.

6. Where's Jack? — He's in the kitchen. He's cooking dinner.

7. Why is she crying?

8. I'm learning the English grammar at the moment.

9. Why are you opening the window? Don't open it. I'm cold.

10. He's doing homework at the moment.

11. Look! Someone's standing near your car.

12. Why are you walking so fast?

13. Mr Tompson lives in London. He's a doctor. But at the moment he is teaching in a University.

14. Helen is on a diet. At present she only eats fruit and vegetables.