我的刚笔在哪?在桌上 Where is my pen? It's on the desk.
这是谁的夹克衫?是海伦的. Whose jacket is this? It's Helen's.
--“Where's my pen?"
--"It's on the desk."
--"Whose jacket is it?"
--"It's Helen's."
Where is my pen?
It’s on the table.
Whose jacket is this?
It’s Helen‘s.