新概念2册句子分析

题目

新概念2册句子分析
However, they have decided to use the post-office.
Letters will cost a litt1e more,
but they will certainly travel faster.
请高手从1：句子成分 2：句子时态 3：固定搭配等几方面来分析一下.
Letters will
这句的will不是将来时态吗？

答案

However,they主 (have decided)谓 (to use the post office.)动词不定式作宾语 现在完成时态
Letters 主(will cost)谓 a little more,一般将来时态 but表转折 they主 will certainly travel谓 faster.一般讲来时态
decide to do 决定做某事
不好意思把will打进括号了结果后来没看到.