insist， persist 和 persever 三者都有 “坚持” 的意思，区别是：
insist v. 坚持 指对意见、主张等的坚持，后面常接on, 后面不能接不定式，也不能接动名词。只能接介词on 或者从句。 insist on sth. / insist on doing sth. / insist that....She insisted on buying the expensive bag. 她坚持要买那个昂贵的包。
He insisted on paying the bill. 他坚持要买单。
They insisted on sending a car over to fetch us. 他们坚持要派车来接我们。
She insisted on her judgement. 她坚持她的判断。
insistent adj 坚持的; 紧急的、迫切要求的
He was insistent on walking home. 他坚持走回家。
persist v. 固执、坚持; 坚持说、反复说。常指对行为、行动的坚持。 用于褒义时，指坚持继续做某事; 用于贬义时指固执、不听劝告，顽固坚持。后面常接 in, 有时也接 to do / withI hope you will persist in your efforts. 我希望你坚持努力。
She persisted in saying she was innocent. 她坚持说她是无辜的。
We persist to do our best to serve our customers. 我们坚持竭尽所能为顾客服务。
They persist with video games. 他们执迷于电子游戏。
persistent adj 固执的、坚持的; 持续的
She is persistent in pursit of the Miss World crown. 她坚持不懈地追求世界小姐的桂冠。
persevere v. 坚忍、坚持不懈、不屈不挠。 褒义词， 后面常接 in, 也可接with / atHe persevered in his efforts to win the election. 他为赢得选举坚持不懈地努力。
If you persever with the work, you will surely succeed. 如果你坚持不懈地工作，你肯定会成功的。
Do you think it is wise to persevere with your plan? 你认为坚持你的计划是明智的吗？
I will persevere at my studies. 我将坚持学习。
perseverance n. 坚忍、坚持不懈
consist v. 包括、由.....组成， 由.....构成 ; 存在于。 常接 ofA week consists of seven days. 一周包括七天。
The United Kingdom consists of Great Britain and Northern Ireland. 联合王国包括大不列颠和北爱尔兰。
consistent adj 一贯的、一致的; 始终如一的
It helps to have consistent habits for studing.养成始终如一的学习习惯是有益处的。
What she said is not consistent with what actually happened.她的话与事实不符。
assist v. 帮助、援助We all assisted in cleaning the apartment. 我们都帮助打扫公寓。
Please assist me. 请协助我。
assistance n. 帮助
I need your assistance in the research. 我需要你在调研上的帮助。
assistant n. 助手、助理 adj 助理的、副的
I am his assistant. 我是他的助理。
She is an assistant coach. 她是副教练。
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