现在完成时:have/has +done(过去分词)
指的是:一个动作发生在过去,对现在有一定影响或造成了一定的结果
eg:I have finished my homework.
这里的have/has 是情态动词,所以变否定句时,直接在后面 + not
eg:I haven't finished my homework.
变一般疑问句 直接提前have/has
eg:Have you finished your homework?
被动语态:be +done
eg:The tree is cut by me.
那树被我砍了.
当然这里的be动词是随时间的变化而变化的.
eg:The cake was maken by me.
蛋糕是我做的.
是被我做的.
发生在过去,所以用was
讲得还是很简单嘛,初一嘛,应该不是很难的