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Образец: The typist had not typed all the letters when I came in.
had not typed – the Past Perfect Active, отрицательная форма от глагола to type.
Came – the Past Indefinite Active от глагола to come

1. Have you finished your work? – Yes, I finished it yesterday.
2. A new theatre is being built in our town.
3. When he came, the contract has already been signed.