新概念第一册自学导读 Lessons31-32

语法  Grammar in use

现在进行时（1）

（1）在英文中若想表达此刻正在进行的动作或事件，要用动词的现在进行时形式。现在进行时由be的现在时形式（am, is, are）+现在分词组成。如课文中的Shes sitting under the tree 和Hes climbing the tree等句子均为现在进行时。对大多数动词来说，在动词后面直接加-ing即可构成现在分词，如doing, climbing。以-e结尾的动词，要去掉-e，再加-ing，如making。如果动词只有一个元音字母而其后跟了一个辅音字母时，则需将与辅音字母双写，再加-ing，如running, sitting。

（2）疑问式：将用了现在进行时的句子变成一般疑问句时只需将助动词提前。如：

Hes reading a magazine.

Is he reading a magazine?

他正在看一本杂志吗？

（3）否定式：现在进行时的否定式是将否定词not放在助动词之后。如：

The dog is drinking its milk.

The dog is not drinking its milk.

狗没在喝它的那份牛奶。

练习答案  Key to written exercises

Lesson 32

A

1  He is opening the window.

2  She is sharpening this pencil.

3  She is dusting the cupboard.

4  She is emptying the basket.

5  He is looking at the picture.

B

1  What is Mr. Richards doing?

Is he cleaning his teeth?

No, he isnt cleaning his teeth.

Hes opening the window.

2  What is my mother doing?

Is she shutting the door?

No, she isnt shutting the door.

Shes making the bed.

3  What is the dog doing?

Is it drinking its milk?

No, it isnt drinking its milk.

Its eating a bone.

4  What is my sister doing?

Is she reading a magazine?

No, she isnt reading a magazine.

Shes looking at a picture.

5  What is Emma doing?

Is she dusting the dressing table?

No, she isnt dusting the dressing table.

Shes cooking a meal.

6  What is Amy doing?

Is she making the bed?

No, she isnt making the bed.

Shes sweeping the floor.

7  What is Tim doing?

Is he reading a magazine?

No, he isnt reading a magazine.

Hes sharpening a pencil.

8  What is the girl doing?

Is she turning on the light?

No, she isnt turning on the light.

Shes turning off the tap.

9  What is the boy doing?

Is he cleaning his teeth?

No, he isnt cleaning his teeth.

Hes putting on his shirt.

10  What is Miss Jones doing?

Is she putting on her coat?

No, she isnt putting on her coat.

Shes taking off her coat.