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is
are
dancing.
speaking.
running.
结构: be+doing ( be要根据主语作人称和数的变化)
现在进行时的四种句式：
1.肯定句—主语+be+doing
Eg: I am doing my homework.
2.否定句—主语+be+not+doing
Eg: I am not doing my homework.
3.一般疑问句—be提到句首（注意人称变化）
Eg: Are you doing your homework?
4.特殊疑问句：特殊疑问词+一般疑问句
Eg: What are you doing now?
句型转换
1.肯定句转换成否定句,要在 be 后加 not 构成
eg:We are reading English now.
?We are not reading English now.
2.陈述句转换成一般疑问句,把be动词提到句首
eg:The student is drinking. ? Is the student drinking?
3.陈述句转换成特殊疑问句,由“疑问词+一般疑问句”构成
eg:He is working. ? What is he doing?
现在进行时
现在分词的构成规则：
1.一般在动词词尾加-ing，如：read-reading
2.以不发音e结尾，去e加-ing，如：write-writing
3.以重读闭音节结尾的动词，末尾只有一个辅音字母，应先双写这一字母，再加-ing。
Eg：swim-swimming run-running
cut-cutting shop-shopping sit-sitting