突然 + adj. - this is used to describe something suddenly happening

坚持 - to persist in

认为- to think;thoughts;

一共 - adverb;total

停-to stop-verb

检查 - verb;to examine

讨论 - to dicuss;verb

突然：

————————————————

认为 think； thought

我们认为学习中文很容易/难。

————————————