Найдите синонимы следующих слов и словосочетаний:
1. to sleep; 2. to have serious problems; 3. garbage; 4. to forecast; 5. to understand; 6. speed; 7. people; 8. condition; 9. perspective; 10. ecological; 11. to throw away

Синонимов много можно подобрать к данным словам и выражениям, все зависит от ситуации. По три синонима или синонимичных выражений приведу к каждому:

1. to sleep – to go to bed, to sack out, to go to rest

2. to have serious problems – to be up against, to be faced with a difficulty, to be in the soup

3. garbage – rubbish, litter, trash

4. to forecast – to predict, to foretell, to prophesy

5. to understand – to comprehend, to realize, to catch on

6. speed – rapidity, quickness, swiftness

7. people – men, folk, human beings

8. condition – factor, situation, status

9. perspective – prospect, outlook, future plans

10. ecological – environmental, bionomic, eco

11. to throw away – to put away, to discard, chuck away