这个是现在进行时结构。
现在进行时表示正在发生或进行的动作。
结构是:be(am,is,are)+动词现在分词形式。(简写:be+动词-ing)
可用来表示现在进行时的时间状语,常用的有:now,this week,right now, at the moment,at present等;或者告诉你一个准确的现在时间,或者用look,listen,smell(常用于句子的开头,表示提醒听者注意正在发生的事情)。
例如:
They are playing basketball now.
现在,他们正在打篮球。
Listen, She is singing an English song.
听,她正在唱英文歌。
Look at the picture. The children are flying kites in the park.
看这幅图。那些孩子正在公园放风筝。
We are making model planes these days.
这些天我们在做飞机模型。
It's 6:30 now. I am getting up.
现在是6:30,我正在起床。
句型分析
1、一般疑问句是将be动词移到主语前面,句末加问号,读升调。
be+主语+doing sth
Are they putting up the scaffolding? Yes, they are. / No, they aren't.
Is he showing a foreign guest round the city? Yes, he is. / No, he isn't.
2、否定句式是在be动词后加not。
主语+be+not+doing sth
I am not working.
He isn't running on the track.
The students aren't playing football.
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