He seems to know this.写下每个单词在句中的成分.额，不明白，求大白！
问题描述：
He seems to know this.写下每个单词在句中的成分.
额，不明白，求大白！
答
he ～主语， know ～谓语， this～宾语
答
He （主语）seems （系动词）to know this（不定式短语作表语）
=It seems that he knows this.
他似乎知道这个