1、一般在動詞詞尾加上-ing ,E.g. jump

2、以不發音字母e結尾的動詞，先去e，再加-ing. E.g have write

3、.以重讀閉音節末尾只有一個輔音字母結尾的詞，它前面是單個元音字母時要先將詞尾的輔音字母雙寫，再加上-ing. E.g. sit put

其句式變換都在be上做文章。

E.g. He is buying a bike.

Is he buying a bike?

He isn’t buying a bike.

一般由look,listen,now, at this moment等時間狀語做標志。

4、習慣進行：表示長期的或重復性的動作，說話時動作未必正在進行。

Mr. Green is writing another novel.

(說話時并未在寫，只處于寫作的狀態。)

She is learning piano under Mr. Smith.

5、表示漸變的動詞有：get, grow, become, turn, run, go, begin等。

The leaves are turning red.

It's getting warmer and warmer.

6、與always, constantly, forever 等詞連用，表示反復發生的動作或持續存在的狀態，往往帶有說話人的主觀色彩。

You are always changing your mind.

典型例題

My dictionary ___, I have looked for it everywhere but still___ it.

A. has lost, don't find　　 B. is missing, don't find　C. has lost, haven't found　 D. is missing, haven't found.

答案D. 前句是一個仍在持續的狀態，應用進行時，由于沒有找到，其影響仍然存在，應用完成時，瞬間動詞用于否定式時可用于完成時。

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