supposition 1

Follow the link to practice using modals for supposition.

http://www.oup.com/elt/global/products/englishfile/intermediate/a_grammar/file03/nef_int_grammar03_b02/

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

http://www.englishexercises.org/makeagame/viewgame.asp?id=484