Раскройте скобки, употребив Present Perfect, Past Perfect и Future Perfect. e. g. The students have discussed the famous scientists. The students had discussed the famous scientists. The students will have discussed the famous scientists. 1. The scientist ... (write) about important events. 2. Food production ... (increase) considerably. 3. The growth of population ... (decline) significantly. 4. We ... (translate) many articles. 5. The students ... (not complete) the experiment.

1. The scientist has written about important events. The scientist had written about important events. The scientist will have written about important events.

2. Food production has increased considerably. Food production had increased considerably. Food production will have increased considerably.

3. The growth of population has declined significantly. The growth of population had declined significantly. The growth of population will have declined significantly.

4. We have translated many articles. We had translated many articles. We will have translated many articles.

5. The students have not completed the experiment. The students had not completed the experiment. The students will not have completed the experiment.