by the time i walked into class,the teacher had started teac

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/27 15:12:34

by the time i walked into class,the teacher had started teaching already.
这里的already能放在HAD后吗?这里的already的用法是怎么用的?
再补充一点,started teaching 能换成started to teach吗

already可以放在had后边
类似already的词,如：never, yet, ever用于过去完成时的时候,放在had 和done中间,即had *** done
start doing和start to do一般不区分
但也有区别,start doing一般指开始一个持续时间较长的动作,还有记住,开始下雨,只能用starts to rain

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