第八课：现在进行时的否定与疑问

本课要点：

现在进行时的否定：

在be动词后面加not

主语+be(am/is/are)+not+动词现在分词+其他成分

She is doing her homework.

She is not doing her homework.=

She’s not doing her homework.=

She isn’t doing her homework.

They are washing their clothes.

They are not washing their clothes.=

They’re not washing their clothes.=

They aren’t washing their clothes.

现在进行时的一般疑问句：

将be动词移到主语前面

Be动词+主语＋动词现在分词+其他部分

He is waiting for a bus.

Is he waiting for a bus?

They are painting the bookcase.

Are they painting the bookcase?

现在进行时的特殊疑问句

特殊疑问词+be动词+主语+动词现在分词+其他部分

What are you doing?

你正在做什么？

Who are you waiting for?

你正在等谁？