| Indefinite | Continuous | Perfect | Perfect Continuous | |
| Present | every week/month/ year, etc. usually often always rarely never sometimes in the morning/ evening/ afternoon at night on Mondays | now at the moment at present nowadays today tonight always still | just ever never already yet always how long so far recently since for today this week/ month | how long for since |
| Past | yesterday last week, etc ago then just now when in 1987 | while when as | just never already yet since for after before by by the time | for since |
| Future | tomorrow tonight next week/ month in two/three etc days the day after tomorrow soon in a week/month | soon in a week/ month | before by by then by the time until | by for |
18
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| / | ||
| Obligation/necessity | Must/have to (You are obliged to) | |
| Advice | Must/should/ought to (I advise you to) | |
| Prohibition | Mustnt (You are not allowed to) | |
| Lack of necessity | Neednt/Dont have to (It is not necessary) | |
| Ability | Can (present) Could (general ability in the past) Was able to (single action in the past) Note: see, hear, feel, smell, taste, understand, remember, guess + could (not was/were able to) | |
| Permission | Can (we know a person well) Could (more polite than can) May (we dont know a person well) Cant‒ refusing permission | Answer: Yes, of course. Of course. Certainly. If we know a person well: Sure. No problem. |
| Request | Can Could Will | |
| Suggestion | Can/Could/Shall | |
| Possibility | May/might/could (perhaps, it is possible) | |
| Offer | Shall (would you like me to do) | |
| Logical assumption | Must (I am sure ) Cant be (I am sure ) |
1. .., .., .. : / .. , .. , .. .: , 2013.- 368.
2. .. . 1. / .. ., .. , .. . .:, 2010. 558 .
3. .. . .2 / .. . .:, 2009. 380.
4. .. EnglishGrammar. ReferenceandPractice: / .. , .. , .. . .: , 2007. - 464 .
5. , . . Revision Tables Student's Grammar Guide. : / .. , .. . - .: : , 2010. - 120.
6. .. 2 / .. . -.: , 2001. 520 .
7. Total Englisch Elementary Mark Foley, Diane PEARSON Longmann -160p.
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8. .., . . / .. , . .: . , 1999. 400.
9. .. / .. . .: , 1994. - 341.
10. .. / .. . .: - , 2001.- 192.
11. . ., .. [ ]: / .. , .. - 95.
12. .., Stuart Cochrane Macmillan Guide to Economics Macmillan Publishers Limited 2007. 135p.
13. .. / .. . .: , 1994. - 341.
14. David Bonamy Technical English: 1A/ David Bonamy, Christopher Jacques. - Pearson Longman Press 2009. - 336 .
15. Samuelson, Paul Anthony. Economics. 14th edition. New York, 1992.
16. Total Englisch Elementary Mark Foley, Diane PEARSON Longmann.
17. Hazlitt Henry. Economics in one lesson. New York, 1990.
http://angl.by.ru/ - . .
http://www.edufind.com/ - English grammar - .
http://enjoy-eng.ru
www.correctenglish.ru
www.lingust.ru/english/english-lessons
www.native-english.ru
www. study-english.info/exercises
www. s-english.ru/exercises
www. engblog.ru tests
Wikipedia (Internet)
