i'm sure of that 从句为什么要省略of

i'm sure of that 从句为什么要省略of I'm sure that 是什么从句?是be sure of that省略of的介词的宾语从句还是形容词的宾语从句? Of that I'm sure 既然有be sure of sth,为什么宾语从句要用be sure that而不是be sure of that呢? I'm sure of that意思 be sure to do sth be sure of sth be sure+that从句 sb.be sure of+从句和sb.be sure that+从句 有什么区别吗? 英语翻译“I’m not so sure about that.I can count the number of wo I'm sure of that i love you.Baby you are my only I'm not sure of that ,And I think he is probably at home .此句 be sure (of) that sure of that是什么意思