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