is to 这个词组什么意思

Question

如题所述

Answer 1

Yes, all I have to do is to learn Chinese.
是的,我惟一要做的事是学习汉语。
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All I have to do is to learn Chinese.
我所要做的事就是学汉语。
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Peter, do you have a lot of things to do today?
彼得,你今天有很多事情要做吗?
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The best way, however, is to keep a good sense of humor.
不过,最好的方法就是保持良好的幽默感。
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It is to begin by the end of this year in San Francisco, California.
该检测将于年底在加州旧金山进行。
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What's more important is to offer the buyers a good product at a good price.
更为重要的是以优惠价格提供优质产品。
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Helen, thy beauty is to me
海伦,你的美貌对于我,
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Canada is to the north of America.
加拿大在美国的北部。
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is to make your interests gradually wider and more impersonal,
就是逐渐使自己的兴趣更加广泛,逐渐摆脱个人狭小的圈子,
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Mexico is to the south.
墨西哥在南部。

Answer 2

is to = is going to 将要

Answer 3

这个不是什么词组

is about to就有， 将要做某事，准备做某事

Answer 4

be to
表示将来，不是很正式。。