Question

Whose pen is this?中主语是谁

Answer 1

Whose pen is this?

主语是this 。

is系动词，whose pen是表语。

句型：主系表句型。

钢笔

Answer 2

Whose pen is this?这个句子的主语是this。

Answer 3

Whose pen is this？
这是谁的钢笔？
主语 this
系动词 is
表语whose pen

Answer 4

主语是 this

Whose pen is this？
这是谁的钢笔？

主系表结构