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Ответ:

What has Henry been watching on TV since 7 o'clock?

Why have you been typing this letter for so long?

They have not been writing the test for two hours.

Mary has been studying at university for two years now.

Where have they been waiting for us?

How long has Eddy been fixing his MP3 player?

I haven't been playing computer games since 5 o'clock.

The girls have been doing the shopping since 10 o'clock.

Liz has been planting flowers in the garden for two hours now.

My granny has been making jam since 11 o'clock.