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1. There are some differences between British and American English.
Are there any differences between British and American English?
What is there between British and American English?
Why are there differences between British and American English?
Are there any differences between British and Canadian English?
There are some differences between British and American English, aren't there?

2. We are trying to solve the problem.
Are we trying to solve the problem?
Who is trying to solve the problem?
What are we trying to solve?
Are we trying to solve the problem or the case?
We are trying to solve the problem, aren't we?

3. There was panic when people realized that the building was in fire
Was there panic when people realized that the building was in fire?
What was there when people realized that the building was in fire?
Why was there panic when people realized that the building was in fire?
There was panic when people realized that the building was in fire, wasn't there?
Was there panic or joy when people realized that the building was in fire?

4. I have been learning Spanish for a few years.
Have you been learning Spanish for a few years?
Who has been learning Spanish for a few years?
How long have you been learning Spanish?
Have you been learning Spanish or French for a few years?
I have been learning Spanish for a few years, haven't I?