1、现在进行时：
肯定句：He is brushing his teeth.他正在刷牙。
疑问句：Are you leaving already?你这么早就要走了吗？
否定句：I'm not doing anything right now.我现在没做什么事情。
2、一般过去时：
肯定句：He climbed a tree.他爬上了一棵树。
疑问句：Did he climb a tree?他爬树了吗？
否定句：I didn't know you like coffee.我不知道你喜欢喝咖啡。
3、一般将来时：
肯定句：It is going to rain.要下雨了。
疑问句：Are we to go on with this work?我们继续干吗？
否定句：He isn't going to climb a tree.
4、现在完成时：
肯定句：He's climbed a tree.
疑问句：Has he climbed a tree?
否定句：He hasn't climbed a tree.
现在完成时句型构成
基本结构：主语＋have/has+动词的过去分词（p.p）＋宾语（或者其他）。
①肯定句：主语＋have/has+动词的过去分词（p.p)（V-ed）＋宾语（或者其他）。
②否定句：主语＋have/has not (haven't/hasn't) +动词的过去分词（p.p）（V-ed）＋宾语（或者其他）。
③一般疑问句：Have/Has+主语＋动词的过去分词（p.p）（V-ed）＋宾语（或者其他）？
肯定回答：Yes,I/we/you/they等（第一人称，第二人称，第三人称复数）have。
或Yes,she/he/it/人名等（第三人称单数）has。
否定回答：No,I/they/we/you haven't.或No，she/he/人名hasn't。
④特殊疑问句：特殊疑问词＋一般疑问句（have/has+主语＋过去分词＋其他）。
⑤被动语态：
现在完成时的被动语态的肯定式为：have/ has +been +done。如：The experiment has been done successfully.这个实验做得很成功。
肯定句：He's climbing a tree.
疑问句：Is he climbing a tree?
否定句：He isn't climbing a tree.
一般过去时：
肯定句：He climbed a tree.
疑问句：Did he climb a tree?
否定句：He didn't climb a tree.
将来时：
肯定句：He's going to climb a tree.
疑问句：Is he going to climb a tree?
否定句：He isn't going to climb a tree.
现在完成时：
肯定句：He's climbed a tree.
疑问句：Has he climbed a tree?
否定句：He hasn't climbed a tree.