Ответ:

he knew three languages

she always brought me flowers

we often saw him in library

took his sister to school

they grew various trees in their garden

2

When was he busy?

When did she work?

How children began to talk?

Where did they see Tom?

What did teacher bring to me?

3

are going

Were

take

are running

4

b

c

b

a

a

b