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When have you left school?
When did you leave school?
How long is she feeling unwell?
How long has she been feeling unwell?
I've met such a nice person before never.
I've never met such a nice person before.
I'm waiting for you since 4 o'clock.
I have been waiting for you since 4 o'clock.
She never wrote a letter by hand since she had bought a computer.
She has never written a letter by hand since she bought a computer.
I am learning English during 5 years.
I have been learning English during 5 years.
Margaret has been taking driving lessons now.
Margaret is taking driving lessons now.
What are you doing since you left Cambridge?
What have you been doing since you left Cambridge?
The jumper was shrinking when I had washed it.
The jumper shrank when I had washed it.
The footballer ran towards the goal when he fell over.
The footballer was running towards the goal when he fell over.
George said that he didn't decide yet which side to support.
George said that he hadn't decided yet which side to support.
I took the decision after I have spoken to him.
I took the decision after I had spoken to him.
Bill was working at the same problem for two hours when Jack phoned him and asked if he solved it.
Bill had been working at the same problem for two hours when Jack phoned him and asked if he had solved it.
I found out why my pen friend didn't get my letters. I've been sending them to the wrond address!
I found out why my pen friend hadn't got my letters. I had been sending them to the wrond address!
