请问if里的那个条件句和虚拟语气是什么啊答:具有上述意义的动词的宾语从句常用“(should)+动词原形”结构。英国英语中常用should,美国英语中一般不用should,而直接用动词原形。该类动词主要有demand, desire, require, request, propose, suggest, command, order, decide, insist, persist 等。1) I suggest you (should) have enough sleep. 我...
在什么情况下动词发生ing形式?答:of, give up, aim at, put off, insist on, persist in, be good at, do well in, can’t help, keep on, leave off, feel like, be tired (afraid, capable, fond) of, set about等。以下为to作介词的短语有:be used to, object to, devote oneself to, stick to, respond to,...