问题标题：
is后面加不定式,表示should?must?还是什么?作文中这种用法怎么样?therefore,thefirstway,thelastwayandthenever-failingwaytoovercomethisdifficultyistopracticeall-roundeducation.
问题描述：
is后面加不定式,表示should?must?还是什么?作文中这种用法怎么样?
therefore,thefirstway,thelastwayandthenever-failingwaytoovercomethisdifficultyistopracticeall-roundeducation.
富煜清回答：
beto意思是：（方法）就是；用来；想要和should或must无关例如：Aknifeistocutwith.【用来】Agoodwaytokeephealthyistoexcercise.【（方法）就是】Abouteighthoursmustbespentinsleepifone...
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