UNIT 6 MODAL VERBS

MEANING	TIME REFERENCE
	PRESENT / FUTURE	PAST
Ability	can	could
		was / were able to
		managed to
Possibility	may, might, could	would/might/could + have + pp (didn't actually happen)
		may/might/could + have + pp (don't know whether it happened or not)
Probability	will	---
Certainty	must, can't	must / can't + have + pp
Obligation	must, have to	had to
Necessity	have to, need to, need	had to / didn't have to
		didn't need to
		needn't have + pp
Advice	should, ought to, had better	should /ought to + have + pp (regret)
Requests	can, could	---
	Would you mind + -ing ...?
Permission	can, could, may	---
	Do you mind if I ...?
Offers	Shall I ...?	---
Suggestions	Shall we ...?	---
	Let's + V
	How about + -ing ...?
	Why don't we ...?

http://www.englishexercises.org/makeagame/viewgame.asp?id=3401

http://actvenglish.blogspot.com.es/2012/06/modal-verbs-exercises-can-must-have-to.html

http://www.agendaweb.org/verbs/modals-exercises.html

http://www.learnenglishfeelgood.com/esl-mixed-modals1.html

http://www.gingersoftware.com/grammarbook/verbs/modal-verbs/

http://www.englishpage.com/modals/interactivemodal1.htm

http://www.englishpage.com/modals/interactivemodal2.htm

http://www.englishpage.com/modals/interactivemodal3.htm

http://www.englishpage.com/modals/interactivemodal4.htm

http://www.englishpage.com/modals/interactivemodal5.htm

http://www.englishpage.com/modals/interactivemodal6.htm

http://www.englishpage.com/modals/interactivemodal7.htm

http://www.englishpage.com/modals/interactivemodal8.htm

http://www.inglesmundial.com/B12/grammar.htm

http://english.baladre.org/sedaviwebfront/hadbetter.htm

http://www.better-english.com/easier/must2.htm

http://www.esl-lounge.com/student/grammar/4g3-modals-deduction-exercise.php

http://www.eflworksheets.com/onlineexercises/elementary/grammar/obligation1.htm

http://www.aulafacil.com/CursoIngles/Ejercicios43.htm

http://www.esl-lounge.com/student/grammar/2g8-must-have-to-difference.php

http://www.esl-lounge.com/student/grammar/2g9-mustnt-dont-have-to-difference.php

http://www.english-zone.com/verbs/can-cant.html

http://www.englishgrammarsecrets.com/could/exercise4.swf

http://www.better-english.com/grammar/wish1.htm

http://www.better-english.com/grammar/wishes.htm

http://www.better-english.com/grammar/wish2.htm

http://www.nonstopenglish.com/lang/es/exercise.asp?exid=917

http://www.nonstopenglish.com/lang/es/exercise.asp?exid=914

http://www.english-4u.de/modal_verbs_ex1.htm

http://www.english-4u.de/modal_verbs_ex2.htm

http://www.english-4u.de/modal_verbs_ex3.htm

http://www.english-4u.de/modal_verbs_ex4.htm