Найдите в предложениях Present Perfect, Past Perfect, Future Perfect.
Переведите предложениях на русский язык.
1. About 75 percent of students receive state grants and 15 percent have been
sponsored by enterprises.
2. That the problem of pollution and ecology had become the most important
for mankind is evident to all.
3. They will have finished the experiment by 12 o’clock tomorrow.