Поставьте глагол в future perfect. 1) the scientists think that they (to prove) their conclusion by the end of their experiments. 2) i think that i (to accomplish) my investigation by the beginning of the next year. 3) the researcher (to isolate) the necessary substance before he begins a new experiment. 4) do you think we (to complete) our observations by the next month?
2) I think that I (shall have accomplished) my investigation by the beginning of the next year.
3) The researcher (will have isolated) the necessary substance before he begins a new experiment.
4) Do you think we (shall have completed) our observations by the next month?