【一般现在时的否定形式和疑问形式】
一般现在时的否定形式是在句中系动词be的后面加上not.疑问形式则是把句中的系动词be 移到主语的前面,特殊疑问句则在句首加疑问词。例如:
They are not playing basketball.
他们没在打蓝球。
I am not doing my homework.
我没有做我的作业。
Are you looking at the blackboard.Yes,I am.
你在看黑板了吗?是的,我在看。
What are you doing here?I am working.
你在这儿干什么呢?我正在工作。
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