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build--built--built--building.
catch--caught--caught--catching.
grow--grew--grown--growing.
eat--ate--eaten--eating
In passive voice and present perfect ,we divide the form into two parts-regular and irregular.
Make Sentences
快一点，其他同学都在等着我们。wait
他已经跑步一个小时了。run
这些照片是十年前拍的。take
那座桥已经被建好了。build
And line the tense and voice of each sentence.
Make Sentences
Hurry up. Other classmates are waiting for us.
He has run for one hour.
These photos were taken 10 years ago.
That bridge has been built already.
Pay attention to the sentences.
1. We’re trying to save the earth.
2. No scientific studies have shown that shark fins are good for health.Present perfect
3.The air is badlypolluted.Passive voice
4.I haven't been asked to the party.
Present progressive
现在进行时: Present progressive
结构: be (am/is/are) + v.-ing
标志词：Look, Listen, now, right now…
e.g. Look! The boy is crying.
定义：表示说话时(瞬间)正在进行的动作, 也表示目前或现阶段正在进行的动作。
Special Using of Present Progressive
1. come, leave,go ,start.
eg. He is coming in two days