defend sb/sth against/from sb/sth 这里的from 和against可以省略吗?

keep sb.from doing sth.和stop sb.from doing sth.中哪个from可以省略 stop sb from doing sth 中from可以省略吗 warn sb.against (doing)sth. get sth from sb hold sth from sb ban sb from doing sth from可以省去吗 有be against sb doing sth 么? 有be against sb doing sth save sb.from sth.和save sb.from doing sth.是一样的吗?两个的意思是什么 convince sb against sth和convince sb of sth有什么区别? 英语：关于be opposite against sb./sth的意思： keep sb./sth from sth.与protect sb/sth from sth含义一样吗?