虚拟语气里有would 和could,什么时候用would ,什么时候用could
问题描述：
虚拟语气里有would 和could,什么时候用would ,什么时候用could
how to motivate criminals to learn would be a problem * officers have to save.
这里的would 可以替换could吗
how to motivate criminals to learn是一个主语从句吧,to learn作主语从句的什么成分.
* officers have to save是个定语从句,为什么把that 和which省略了
答
不能,would be表示会成为 could be能成为
to learn是宾补
定语从句中缺宾语,所以引导词可以省略那些成分可以做宾语补足语动名词，不定式动名词可以帮助举个例子吗I want you to go home这个还是不定式的宾补，您举个例子说一下动名词的宾补好吗哦，不好意思我看错了I heard you singing songs at 8:00 this morning.像都是see/hear sb doing都是动名词作宾补