sth of sb的疑问?

learn doing sth from sb.的疑问 relive sb of sth cure sb.of sth.. warn sb.of sth. accused sb of sth rob sb.of sth.的sb可不可以不加? require sth of sb,require sb of sth,require sb sth这三个那个是对的? sb afraid of doing sth和sb afraid of to do sth的区别在哪里? require sb.of sth.与require sth.of sb.的区别 warn sb. about sth.与warn sb. of sth.的区别他们等于warn sb. sth.吗若不等 warn sb.about sth.与warn sb.of sth.的区别他们等于warn sb.sth.吗若不等于他们 accuse sb of doing sth of的涵义