Verneinung im past perfect

Verneinen Sie die folgenden Sätze in der jeweiligen past-perfect-Form

He went to open the door.
She has sat in the chair for two hours.
They had gone to Spain before they came here.
We are in big trouble.
You will find your glasses.
The table will have been set by three o'clock.
Tom could drink 5 litres of beer in 2 minutes.
The camera was set for taking photos.
They have been given him a good idea.
The student writes letters.

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