现在进行时: 表示正在进行的、发生的动作
通常在句子中有以下的词：now, look, listen, at present.
句子的结构如下： be am
is + 动词 ing
are
如：1. I am listening to the music now.
2. The students are drawing pictures now.
3. Listen! She is singing .
4. Look! Mr Li is riding a bike.
特殊疑问句：What are you doing ?
What is he / she / it doing?
一般疑问句：Are you cleaning the room now?
Is she / he / it watching TV now ?
否定句： I am not playing football .
She / He is not swimming now.
3. 动词现在分词构成:
1) 正常变化是在动词原型后加ing 如:
read----reading ; drink---drinking ; eat---eating ;
2) 以e结尾的动词，去掉e再加ing 如:
write ---writing ; make--- making ; ride---riding ;
3).重读闭音节（ 只有一个元音字母，而其后跟有一个辅音字母时）要双写结尾的辅音字母再加ing
sit---sitting ; swim--swimming ; put---putting ; run-running
练习
1．Mr Liang (read) a book now.
2. The mouses (run) now.
3.. Look ! Amy and John (swim).
4. My sister (make) a kite in his room now.
5. Look! The bus (stop).
6. We (have) an English class now.
7. Listen! Someone is (come).
8. They (catch) insects now.
9. He (do) an experiment now.