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,the first way,the last way and the never-failing way to overcome this difficulty is to practice all-round education.

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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,the first way,the last way and the never-failing way to overcome this difficulty is to practice all-round education.
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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,the first way,the last way and the never-failing way to overcome this difficulty is to practice all-round education.
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,the first way,the last way and the never-failing way to overcome this difficulty is to practice all-round education.

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,the first way,the last way and the never-failing way to overcome this difficulty is to practice all-round education.
be to 意思是:(方法)就是;用来;想要
和should或must无关
例如:
A knife is to cut with.【用来】
A good way to keep healthy is to excercise.【(方法)就是】
About eight hours must be spent in sleep if one is to effectively.【想要】
句子翻译:因此,要克服这一困难,最重要,最基本,也永远不能改变的方法是发展全面教育.
在作文中的效果要视你所处等级而定,如果是高一或者以下水平的,这个用法不错,一部分人可能没这种习惯或是一时没想到.如果是以上的,那就不是特别出彩,但也还行,总之多看多背.
就问这词组好不好,有点奇怪……

这些问题最好问老师,或者买一本语法书看,我英语也不怎好,帮不了你

不表示什么意思,这里就是to do 结构做表语,和is 组成的系表结构