Practice your modals

Here are a few webpages to practice modals for speculation:

http://esl.about.com/library/grammar/blmodalprob.htm


http://www.oup.com/elt/global/products/naturalenglish/int/a_grammar/unit11/neint_grammar11_exp/


http://learnenglish.britishcouncil.org/en/grammar-explained/modals-%E2%80%93-deduction-present

http://learnenglish.britishcouncil.org/en/grammar-explained/modals-%E2%80%93-deduction-past