4. 某些动词后的宾语从句中谓语动词要用虚拟语气

　　在一些动词后面的宾语从句中，谓语动词要用虚拟语气。这时，谓语动词用动词原形或should 动词原形。这类动词一般表示命令，要求，决定，建议，主张等概念，主要有：advise, ask, command, decide, demand, desire, direct, insist, move, order, propose, recommend, request, require, suggest,等。

　　The workers demanded that their wages (should) be raised by 10 per cent.
　　The teacher decided that you do the experiment first.