作謂語時動詞加ing前面必須加上be動詞，形成be 動詞ing(現在分詞)作句子謂語，構成進行時態句子。
He is listening to music now.
他正聽音樂。
We've been waiting for them for two hours.
我們等他們兩個小時了。
He was doing his homework when his mother came in.
他媽媽進來時，他正在做家庭作業。
1、動詞作介詞的賓語要加ing(動名詞)
The girl is so excited about hearing from her boyfriend.
這個女孩收到男朋友的來信很興奮。
I'm looking forward to seeing you again.
我期盼著再次見到你。
2、部分動詞用動詞作賓語。作賓語的動詞要加ing(動名詞)
The student was practising making a new vowel sound.
這個學生正在練習發一個新的元音。
I don't mind doing chores.
我不介意做家務。
Mary enjoys reading very much.
瑪麗非常喜歡閱讀。
3、一些固定句式后面要加動詞ing(現在分詞)
We're going to have fun doing sports after school.
放學以后我們將愉快地進行體育活動。
He is quite used to working hard.
他很習慣努力工作。
Most students have problems speaking English.
大多數學生說英語有困難。
I prefer walking to cycling.
我愿意步行，而不愿意騎自行車。
4、動詞作主語和表語時，動詞要加ing(動名詞)
Working with you is a pleasure.
和你一起工作是一種樂趣。
Seeing is believing.
眼見為實。
5、動詞修飾名詞做后置定語時，要加ing(現在分詞)
There is a girl crying over there.
那邊有個女孩在哭。
She heard someone singing in the next room.
她聽見有人在隔壁的房間里唱歌。
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