Пожалуйста!определите видо-временные формы глаголов и укажите их инфинитив.
1. Mr Smith is reading a letter from our company now.
2. The engineers studied the catalogues of Dun & Co yesterday.
3. We'll deliver the goods in April.4. Our manager usually makes contracts with Smith & Co.
5. Today they have shown the new model of the equipment to the Russia businessmen.
6. The secretary was looking through the mail yesterday at three.​

1. Mr Smith is reading a letter from our company now.

is reading-Present Continuous.

(To read)

2. The engineers studied the catalogues of Dun & Co yesterday.

studied-Past Simple. (to study)

3. We'll deliver the goods in April.

will deliver-Future Simple. (to deliver)

4. Our manager usually makes contracts with Smith & Co.

makes-Present Simple (to make)

5. Today they have shown the new model of the equipment to the Russia businessmen.

have shown-Present Perfect (to show)

6. The secretary was looking through the mail yesterday at three.​

was looking-Past Continuous (to look)