常用的 's=has 's=is 'd=would 'll=will s'=s's.如朋友们的,不能用friends's.要用friends' ain't=am not,are not,is not,have not,has not C'Mon=come on don't=do not didn't=did not can't=can not wouldn't=would not couldn't=could not shouldn't=should not havn't=have not hasn't=has not hadn't=had not mightn't=might not mayn't=may not may've=may have 等、、、、