might, can, may possibly, may perhaps, may well, possibly will. If these don't work go on Microsoft word, type in the word could, right click on it then click synonyms and you can find your awnser
yea, yeah, sure, affirmative, all right, yep, very well, unquestionably, granted, by all means, true, gladly in other words, yes you can have synonyms for yes. *note* most listed here were taken off...