現在進行時
——表示現在正在進行的動作
構成：主語+be動詞+動詞的現在分詞+其它成分
We are having lunch.
He is reading a book.
The dog is running after a cat.
The boys are swimming across the river.
★變疑問句將be動詞移到句首
Are we having lunch?
Is he reading a book?
Is the dog running after a cat?
Are the boys swimming across the river?
★變否定句在be動詞后面加 not
We are not having lunch.
He is not reading a book.
The dog is not running after a cat.
The boys are not swimming across the river.
★特殊疑問句：what, which, how, where, who, etc.
疑問詞+動詞+主語+現在分詞
What are you doing?
What is she doing?
What is the dog doing?
沒有進行時的動詞(必背)
表示狀態，思想，感情和感覺的動詞不能表示正在進行的動作：
1. 表示感覺，感官的詞
see, hear, like, love, want
2. have, has當“擁有”講時沒有進行時