Есть несколько вариантов :
1.Им лень
2.Нет возможности
3.Считают это ненужным
Liza: This party is very cool!
Steve: Yes, it is.
Liza: Hey, look at this girl in blue dress. Who's she?
Steve: The one with the blond hair?
Liza: Yes, what's her name?
Steve: It's Betty, she has a little brother Jo.
Liza: She's got a nice dress. How old is she?
Steve: She's fourteen.
Liza: What's she like ?
Steve: She is beautiful and kind, come and meet her.
I'm going to write Peter tomorrow evening
We are going to have a dictation soon
They are going to read this book tomorrow
My friend is going to speak to her tomorrow morning
My sister is going to have English in a week
These engineers are going to work in the Ministry next month
His sons are going to meet their friend next week
Задание1: could
Задание4:
1)shouldn't
2)must
3)should
4)needn't
5)had to
6)should
7)shouldn't
8)must
9)mustn't
10)had to