蓝皮 练习题精选-70

A President entering the final two years of a second term is likely to be at a severe

disadvantages and often unable to carry out a legislative program.

(A) likely to be at a servere disadvantages and is often unable to

(B) likely serverely disadvantaged and often unable to

(C) liable to be severely disadvantaged and cannot often

(D) liable that he or she is at a sereve disadvantage and cannot often

(E) at a severe disadvantage, often likely to be unable that he or she can

答案是Ａ．请解释一下～

顺便还想问问，那个ｉｓ在第二次出现时，什么情况可以省，什么情况不可以啊？　多谢了！

作系动词都省略，除非有时态和数的变化。

这道题里的is我认为是情态动词的组成部分,也是固定用法，所以不省略。

be likely to do 和 be able/unable to do

。。。

can 跟 be able to do

我觉得有时候 有区别

can是主观能力

able是客观能力

I cannot open the door...I don't want to open the door

I am unable to open the door...I can open the door...but I am unable to do it because I don't have the key...

是绝对的不同。

can表客观， be able to表主观，不能互换

SC里不要轻易改动情态动词

谢谢思故斑竹，你真好～