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Passive They have just done the test they had learned a lot about animals by friday

The test has just been done by them.

Has the test just been done by them?

What has just been done by them?

Has the test or has the work just been done by them?

Has the test just been done by them or by you?

The test has just been done by them, has not it?

A lot about animals had been learned by Friday.

Had a lot about animals been learned by Friday?

What had been learned by Friday?

When had about animals been learned?

Had a lot about animals been learned by Friday or by Monday?

A lot about animals had been learned by Friday, had not it?