a few days ago, i saw one of my classmates cheating on the accounting eam. i was so surprised that she did such a thing. it made me feel sad and confused. why did she cheat? maybe she just wanted to get higher grades and didnt want to lose
cannot help后加动名词。cannot：不能; can 的否定形式。help：v. 帮助; 协助; 援助; 改善状况; 促进; 促使; 搀扶; 带领。n. 帮助; 协助; 援助; 有助益的东西(如忠告、钱等); 有用。
如果是完成时,是havehashadwould have + not + 动词过去分词（动词P.P）；如果是一般现在时,是doesdo + not + 原形；如果是现在进行时,是be(am is are) + not + 动词ing形式；如果是被动语态时,是waswere + not + 动词过去分词(P.P)等。