句子分析,帮我看看If one thing guarantees another,the first is certai
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If one thing guarantees another是条件状语.主语是the first(thing).is certain to cause the second thing to happen.是做表语,be certain to 是固定短语,一定……

be certain to do sth一定做某事.to cause是不定式做定语,to happen是做定语的补语.

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