问题补充：
语法书说只有do 和did在时,才是强调.没有does这种用法呢.
汗,什么书,这么写,不是误导小孩子么.
助动词do 可以起到加强语气的作用.
现在时,就是do/does(三单时)
过去时,就是did
记好了,别忘了,
该文件似乎(确实)是基于一种不切实际的乐观主义.
是强调作用.
the document does seem to be based on an unrealistic optimis
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