vi.　合作；配合，协助 work or act together with another or others; be helpful and do as one is asked

　～ closely　密切地合作
　～ enthusiastically　热情地合作
　～ happily　愉快地合作
　～ harmoniously　协调地合作
　～ successfully　成功地合作
　～ whole-heartedly　全心全意地合作
　～ in　在…方面合作
　～ in a movement　在运动中合作
　～ on　在…方面合作
　～ on a problem　在某问题上合作
　～ towards the end　协力达到那个目标
　～ with　与…合作，同…协力，与…相配合
　～ with a foreign expert　和外国专家进行合作

　Please cooperate, if not, we'll accuse you.　请合作一下，否则我们会控告你的。
　"If you cooperate, we'll let you go."said the policeman.　警察说道：“如果你协助我们，就放你走。”
　We hope we can cooperate even more closely in the future.　希望我们今后能更加密切地合作。
　They will cooperate after today.　从今天开始，他们将合作。
　Let's cooperate to get the work done quickly.　让我们大家合作起来把这项工作迅速完成。
　Everything cooperated to make the party a success.　各种因素配合使聚会非常成功。
　The weather, the scenery and good company cooperated to make our trip a great success.　天气、风景和好旅伴使我们这次旅行非常成功。
　Unemployment and lingering disease cooperated to make his family broken.　失业加上长期的疾病，使他倾家荡产。
　Two well-known firms of drug manufactures are cooperating to find a cure for cancer.　有两家著名的制药厂正在合作寻找一种治疗癌症的药物。

 ♣ cooperate in　(v.+prep.)
　在某事上给予合作　be helpful with (sth such as a plan)
　They cooperated in the movement.　他们在这项运动中进行合作。
　All people cooperated in the development of our country.　每一个人都为国家的发展而齐心协力。
　Everyone cooperated in decorating the classroom.　大家齐心协力装饰教室。
 ♣ cooperate on　(v.+prep.)
　在某事上给予合作　be helpful with (sth such as a plan)
　I should like you to cooperate on the writing of my next book.　我希望你能在我写下一本书时给予合作。
　I hope you can cooperate on this matter.　我希望你在这件事上能给予合作。
　I'll be very glad if you cooperate on the development of this kind of new plan.　如果你能在这项新计划的发展上给予合作的话，我会十分高兴的。
　They will cooperate on this research.　他们会在这项研究上给予合作的。
 ♣ cooperate with　(v.+prep.)
　与（某人）协作，合作　be helpful towards (sb)
　I will cooperate with you.　我将与你合作。
　Can you cooperate with us?　你能和我们合作吗?
　The British cooperated with the French in designing the satellite.　英国人和法国人合作设计了那颗卫星。
　The children cooperated with their teachers in keeping the classroom neat.　孩子们和老师一起保持教室整洁。

 ♣ cooperate with, collaborate with, play ball with, team up with
　这组短语都表示“与…合作”的意思。其区别在于：cooperate是一般用语，强调“自愿”; collaborate有明显的感情色彩，与同伙人合作含褒义，与敌方合作表示“通敌”，含贬义；play ball with是非正式用法，多用于表示“狼狈为奸”; team up with则表示组成一个队或组共同做某事。