4. Запиши выражение к задаче. В библиотечном зале 20 стеллажей по 8 полок в каждомНа каждой полке стоят по 30 книг. Сколько всего книг взале?​

ответ: 2800 всего книг в зале

1 предложение уже в Present Simple
2 She prepared breakfast yesterday.
3 She will prepare breakfast tomorrow morning
4 She is preparing breakfast now.
5 She was preparing breakfast yesterday at that time.
6. She will be preparing breakfast tomorrow at this time.
7 She HAS already PREPARED breakfast
8 She HAD PREPARED breakfast by 7 a.m yesterday
9 She will have prepared breakfast by 7 a.m. tomorrow
10 She had been preparing breakfast for 10 minutes already by that time yesterday.
11 She will have been preparing breakfast for 15 minutes by this time tomorrow.
 

1. They noticed some change in the weather.
General question - Did they notice any change in the weather?
Disjunctive question - They noticed some change in the weather, didn't they?
Negative - They didn't notice any change in the weather. 

2. I have promised good to the industrious students.
General question - Have I promised good to the industrious students?
Disjunctive question - I have promised good to the industrious students, haven't I?
Negative - I haven't promised good to the industrious students.

3. There is an invitation to the Exhibition on your desk.
General question - Is there an invitation to the Exhibition on your desk?
Disjunctive question - There is an invitation to the Exhibition on your desk, isn't there?
Negative - There is no invitation to the Exhibition on your desk. / There isn't any invitation to the Exhibition on your desk.

4. They will join their group in a moment.
General question - Will they join their group in a moment?
Disjunctive question - They will join their group in a moment, won't they?
Negative - They won't join their group in a moment.