Как составить 7 предложений про птиц

In winter, many birds fly south.

1. the scientist … (has written) about important events. 2. food production has (increased) considerably. 3. the growth of population … (has declined) significantly. 4. we … (have translated) many articles. 5. the students … (have not completed) the experiment.1. the scientist … (had written) about important events. 2. food production had (increased) considerably. 3. the growth of population … (had declined) significantly. 4. we … (had translated) many articles. 5. the students … (had not completed) the experiment. 1. the scientist … (will have written) about important events. 2. food production will have (increased) considerably. 3. the growth of population … ( will have declined) significantly. 4. we … ( will have translated) many articles. 5. the students … ( will not have completed) the experiment.