I suppose that he is no more than twenty.是宾语从句吗? 各个成分说下

是宾语从句.
1 I (主语)suppose （谓语）that （宾语从句的连接词）
2 he（宾语从句部分的主语） is （系动词谓语）no more than （副词短语做限定）twenty（表语）
3 no more than == about as old as ,only about