Вправа 8. Визначте час та стан дієслова присудка. Утворіть заперечну форму від наступних речень.

1.The temperature has been maintained at the point of 20 degrees since the beginning of the experiment. 2.The new apparatus had already been installed when the delegation arrived. 3.He has been interested in history since his childhood. 4.The explanation of these strange facts hasn’t been received by the evening. 6.From his early childhood Pierre Curie had been fascinated by science.7.Dinner will have been cooked by the time you return. 8.The bed had not been lain on.
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