Memorize these very common words that have a final s. The s is pronounced as /z/ and not as /s/.

was, is, as, his, hers, has, these, those, whose, goes, does, always, because

Warning: Common Mistake

Note that the s in the prefix dis– is pronounced as /s/ and not as /z/.

disagree, disorder, disobey, disapprove, disappear, disability