Crossword Puzzle Modal Verbs CrosswordOnline version Test your knowledge of modal verbs with this crossword puzzle. by karen bejarano 1 Expresses ability or possibility. 2 Indicates necessity or strong recommendation. 3 Suggests advice or obligation. 4 Shows permission or possibility. 5 Indicates possibility or uncertainty. 6 Preferring one things to another 7 Expresses ability or past possibility. 7 4 2 6 1 5