we should be able to catch them
来源:百度知道 编辑:UC知道 时间:2024/05/28 03:58:33
be able to 必须有吗?没有它是什么意思
should 能不能换成can
should 能不能换成can
句意:我们应该能够赶上他们。
这里should表示推测。
如果没有be able to的话,就是:我们应该赶上他们。
这时should就成了用来表示义务的了。
所以be able to不要轻易去掉。
should如果换成can,语法上还是正确的,但表示的可能性就会变得稍微大一些了。
我们应该能赶上他们
be able to
v.
能, 会
should不能换成can
be able to 必须有,表示有能力去做
should 和can 表达的意思不同
前者表示可以(不肯定),后者表示肯定
be able to =can,能够
should 不能换成can
否则,意思与be able to 重复
我们应该能抓到它们
should是应该的意思
be able to是能的意思,跟can接近
虚拟语气
表示与事实相反的假设
也就是说应该抓到,但是事实是没有!
we should be able to catch them
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