1、定義：表示現(xiàn)在或現(xiàn)階段正在進(jìn)行或發(fā)生的動作。句中常有now，look，listen等詞。
如：I am washing clothes now.
Look! Liu Tao is climbing the tree.
Listen! Jane is singing in the music room.
2、構(gòu)成：be動詞(am/is/are)+ 動詞現(xiàn)在分詞(V-ing)
3、動詞現(xiàn)在分詞構(gòu)成：
① 一般是在動詞原形后加ing
如：read-reading，drink-drinking，eat-eating，look-looking
② 以不發(fā)音的e結(jié)尾的動詞，去掉e，再加ing
如：write-writing，make-making，ride-riding，take-taking
③ 以重讀閉音節(jié)結(jié)尾，如末尾只有一個輔音字母，要雙寫這個字母，再加ing
如：sit-sitting，swim-swimming，put-putting，run-running，stop-stopping，get-getting，begin-beginning，jog-jogging，forget-forgetting
4、動名詞其實就是動詞的現(xiàn)在分詞，它既有名詞性質(zhì)(可作主語)，又有動詞性質(zhì)(可帶賓語)。
如：Asking the way
My hobby is collecting stamps.
He is good at skating.
5、現(xiàn)在進(jìn)行時的句型轉(zhuǎn)換：
肯定句 否定句 一般疑問句及回答
He is running now. He isn’t running now. —Is he running now?—Yes, he is. / No, he isn’t.
They are makinga puppet. They aren’t makinga puppet. — Are they making a puppet?—Yes, they are. / No, they aren’t.