the pen out of ink,for it write

来源：学生作业帮编辑：搜狗做题网作业帮分类：英语作业时间：2024/05/02 04:28:09

the pen __ out of ink,for it __ write
答案是must have run,won't
请问为什么这里用must绝对的完成时?
won't 用一个将来时态这里又是为什么呢

must have run 是对过去事情肯定的推测,意为：一定已经没有墨水了.
for it won't write.中的will是助动词,后跟动词原形,它有一个用法是表示功能,意为“能,行”,所以该句译为：因为它不能写了.
can是表示能力,不表示功能,所以这儿不用can.

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