C Ask and answer
1

2

3
4

5

6
What's/What are ... doing?
He's/She's/They're ...

答案略

D Read and choose
() 1 Nick climbing the tree now.
a am
b is
c are
() 2 Bobby likes grapes. He some grapes in his garden.
a grow
b are growing
c grows
() 3 We the bed now.
a making
b make
c are making
() 4 There some water in the glass.
a am
b is
c are
() 5 They their mother in the kitchen now.
a are help
b are helping
c is helping
() 6 Look! Mike and John basketball.
a playing
b is playing
c are playing
() 7 Listen! Nancy in the classroom.
a sing
b are singing
c is singing

E Read and order
1 cleaning, I, the, am, table

2 sweeping, Helen, the, is, floor

3 mother, kitchen, cooking, in, my, the, breakfast, is

4 some, there, grapes, the, are, pests, on

5 apples, big, the, sweet, are, and

1. I am cleaning the table.
2. Helen is sweeping the floor.
3. My mother is cooking breakfast in the kitchen.
4. There are some pests on the grapes.
5. The apples are big and sweet.

这是连词成句题型，需结合本单元所学的现在进行时结构（主语+am/is/are+现在分词+其他）、there be句型及陈述句主系表结构来组合单词，注意句子首字母大写，句末加标点。