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1、The story is moving,and the questions ,I suppose,are not s

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1、The story is moving,and the questions ,I suppose,are not so difficult as they appear (to answer)
为什么这儿用 to answer 而非 to be answered
2、If water becomes increasingly scarce in decades (to come),water shortage will become a hot issue all over the world.
为什么这里填to come,是句子的什么成分呢?
3、The company is quite honest and guarantees the new product (shall) be under warranty for three years.
为什么用shall而不用will
answer动作由sb.发出,It is difficult for sb.to answer the question.