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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?
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1) The scientists think that they (will have proved) their conclusion by the end of their experiments.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?