比如说She does not understand English.这里面为什么不用She is 而用she does

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比如说She does not understand English.这里面为什么不用She is 而用she does?
那在什么情况下用am is are 什么情况下用do does呢?

句子里有实意动词时,用does或do,比如,understand是实意动词
am,is are总是和作表语的形容词连用
比如,She is nice.The kids are clever.nice 和clever都是形容词,它们前面就用am,is are,而用不到do does 了

比如说She does not understand English.这里面为什么不用She is 而用she does Does she teach English?does换is 行吗,为什么 She does the housework.为什么要用does,不用别的? does she teach English? "where does she live" 的"dose"为什么不用"is" She does not know . She does not healty! she is English后面为什么不加does? "She studies English.""So does she."还是"So she does. 英语翻译Mary does not understand such sentences as"She is blue t She does not like orange.为什么不说She is not like orange. she does not like apple 为什么不能改成she is not like apple