请比较：
1 I (主语)know（谓语） you （宾语）to be good at maths (宾语补足语)
2 You are a student （ good at maths ）-----括号中的内容是定语後置,修饰前面的student.
3 I know you are a student (who are good at maths)-------括号中的内容是定语从句,修饰前面的student.啊 谢谢能在详细讲讲第一个句子吗ok.believe / think / know / suppose / find / considersb to do / have done sth1 we know him to be honest in the job2 we find him to have been honest in the job he did.3 he is cosidered to have invented the first ever PC.4 He is supposed to be writing his 67th book for children.