There's （a sign） on the wall.否定句、一般疑问句、提问

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There's （a sign） on the wall.否定句、一般疑问句、提问

否定句 There is not a sign on the wall.
一般疑问句 Is there a sign on the wall?
提问 What is on the wall?

There isn't a sign on the wall
Is there a sign on the wall?
What is that on the wall?

There is not a sign on the wall.
Is there a sign on the wall?
What is this on the wall?

There isn't a sign on the wall.
Is there a sign on the wall?
What is that on the wall?