am / are / is + V-ing
1. 敘述正在進行的動作,強調動作的進行
1. He is entering the room at the moment. 他在這一刻進房間。
2. She is crying. 她在哭。
2. 暫時性的動作亦或短暫的動作,與以前不同,一段時間之後也可能沒有
1. I am teaching English grammar this semester. 我這學期在教授英文文法。
2. I am wearing a coat today though I seldom wear one. 我今天穿著一件大衣雖
然我幾乎 很少穿。
3. 表一直重覆之動作
(always, constantly, forever, repeatedly)
Why are you always sleeping in class? 你為什麼總是在課堂上睡覺。
4. 來去動詞進行式代替未來式
(go, come, start, leave, arrive...)
1. He is leaving for Australia next Monday. 他下星期一要前往澳洲。
2. I am going to London tomorrow. 我明天要去倫敦。
3. He is arriving tomorrow morning. 他明天早上會到達 。