modals expressing probability

http://speakspeak.com/english-grammar-exercises/intermediate/modal-verbs-for-past-probability-must-have-cant-have-couldnt-have-may-have

http://web2.uvcs.uvic.ca/elc/studyzone/410/grammar/410-modals-of-possibility-and-probability-for-past-situations1.htm

https://sandymillin.wordpress.com/2011/10/18/key-word-transformations-with-modals-of-speculationdeduction/

 

B2 First Use of English Part One speculating practice

B2 First Use of English Part Two speculating practice

 

would rather/had better

http://www.autoenglish.org/gr.better.i.htm

http://www.englishexercises.org/makeagame/viewgame.asp?id=5948

https://elt.oup.com/student/englishfile/upperint/e_minigrammar/nef_upperint_minigrammar04?cc=hu&selLanguage=hu

I’d rather you DIDN’T/HADN’T explanation:

http://www.myenglishteacher.eu/question/i-would-rather-you-didnt-i-would-rather-you-hadnt/