По ! нужно придумать так называемые разделительные вопросы(disjunctive questions или tag questions). вместо "…" нужно вставить придуманное начало. 1)…,isn't it? 2)…,aren't i? 3)…,are you? 4)…,am i? 5)…,was it? 6)…,weren't they? 7)…,won't you? 8)…,will you? 9)…,isn't there? 10)…, aren't there? это !

It is a pen,isn’t it?
I am a student, aren’t I
You aren’t play the piano,are you?
I’m not a teacher,am I.
It wasn’t a great idea,was it?
They were at home this morning,weren’t they?

You want study hard,won’t you?
You won’t be able to make a cake,will you?
There is a man, isn’t where?
There are dogs,aren’t there