Question

Little Bob is too shy to speak if he is not spoken to

Answer 1

填上：unless spoken .

原句的意思是：小Bob太怕羞了,如果没有人跟他说话,他都不会主动说的.

unless是“除非”.本来完整的同义句应该是

Little Bob is too shy to speak unless he is spoken to.小Bob太害羞了,除非有人跟他说话,否则他是不会主动开口的.

unless引导的从句中：

1、主语和主句的主语一样,都是指Bob

2、从句谓语是be动词

满足以上两个条件,可以省略主语和be动词,变成Little Bob is too shy to speak unless spoken to.