动词在什么时候用过去式,和ing
动词ing形式是在什么时候用啊。
追答现在进行时态表示现在正在进行着某种事情,其构成形式是助动词“be+动词-ing。动词-ing是动词的分词形式,动词be要根据主语人称进行变化.
结构 主语+be+doing+事情 定义: 表当前发生的
通常在句子中有以下的词:now, look, listen.
句子的结构如下: be am
is +动词 ing
are
肯定句:be + doing
否定句:be not + doing
疑问句:Be + 主语 + doing?
如:
肯定句:1. I am listening to the music now.
2. The students are drawing pictures now.
3. Listen! She is singing .
4. Look! Mr Li is riding a bike.
否定句:1.I am not (I’m not)listening to the music now.
2.The students are not(aren’t) drawing pictures now.
疑问句:
1. Listen! Is Amy singing?
Yes,she is.\No, she isn’t.
2. What are they doing?