原形"，should可以省略。

It is desired that we (should) get everything ready by tonight.

1. 在suggestion, proposal, order, advice, demand等名词后接的表语从句或同位语从句中，谓语动词

用"should+动词原形"，should可以省略。

There's no suggestion that you (should) resign.

2. 在"It is (high) time that..."这一特殊句式中，谓语动词用过去式或should do的形式表示虚拟，

should不能省略。

It's time that we went home.

一， 虚拟语气-在口语，非正式用语中

1. 用if I were you, I'd...句型，语气更委婉，含蓄。

If I were you, I'd go with them.

2. 用I think you should /ought to do...句型，语气稍强。

I think you should buy him a gift.

3. 如果要强硬的批评，责备某人或提出建议，可用下列句型：

①It's about/ high time that...

It's about time you got down to reading.

②You'd better do sth. / You'd better not do sth.

You'd better give him some advice on it.

③I'd rather sb. did sth.

I'd rather you came tonight.

例 1. You _____ trust an online shop just because it has a beautifully-designed website.

A. shouldn't

B. mustn't

C. couldn't

D. needn't

解析：句意：你不应该仅仅因为有一个设计优美的网站就相信一家网店。本题考查情态动词。根据句意可知此题选择A项shouldn't不应该。mustn't禁止；couldn't不能；needn't不需要，均不符合句意。

答案：A。

例 2. Eye doctors recommended that a child's first eye exam _____ at the age of six months old.

A. was

B. be

C. were

D. is