请问为什么用这个答案we went to shanghai for a holiday____ on a ship,首先,为什么不用on ship,第二,为什么用on a ship

请问为什么用这个答案we went to shanghai for a holiday____ on a ship,首先,为什么不用on ship,第二,为什么用on a ship 请问这个题目选择哪个答案,并给出理由“When did you go to work?” “As soon as they came,we ______ to work.”a.went b.were going c.had gone d.go错误的答案.............为什么选A? We found people friendly _______ we went.为什么答案是 to which 还有就是, We went to climb mountains last weekend.为什么这个句子的 went to climb 中间要加to? After watching the dolphin show , we went to see a big octopus. 请问这里为什么要用watching? 虚拟语气选择题We went to work on foot yesterday,though we ______by bus.A.could have gone B.must have gone C.ought to have gone D.had better to请问这个选择什么?为什么?说的详细些 We went to travel with some friends of _________ .us ours our ourselves 为什么答案选ours 而不是us We went to the library in twos and threes,为什么用介词in 请问We should make every effort to protect our environment.这个句子应该用we are should 为什么?该用 to protecting our environment.为什么? we went to the beach last Sunday ,and we had great fun playing volleyball.为什么要用play +ing 选择最恰当的答案：具体说出为什么 We went to Shanghai last summer and we stayed there forA;sometime B:some time C:sometimes D:some times 十万火急：we all agreed to his suggestion that we went to pairs for sihgtseeing为什么went要改为 go? ___of us went to see the film because we had money to buy tickets yesterday.答案为“All”为什么不能填“Each” WE WENT TO RETURN SOON we went to the cinema. we went to the amusement we went to a b_______beach. 高中英语题we should have studied last ,but we .we should have studied last night,but we went to the concert instead 这个should have studied 为什么不能用would have studied?两者有什么区别吗