我回到了温哥华 是i have come back vancouver 还是i have come back to vancouver

我回到了温哥华 是i have come back vancouver 还是i have come back to vancouver i have come here是什意思 请问May i come in?和 May i have two badges?这些句子的否定回答该怎么答?请注意了，我要的是否定回答！ I have come so 为什么从中国飞温哥华要比从温哥华飞中国快从温哥华飞中国,一半是12个小时左右,可是有一次我从国内飞温哥华的时候,自己用手机的秒表计了下时,全程总共用10个小时.根据地球自传,自转方 关于need的提问（3题目 希望亲分析下）1. Today is your holiday. You ________ here to work.A. shouldn't have come B. needn't have comeC. mustn't have comeD. cannot have come答案是B 我选了A2. You _______ me up. I donn't hav now that引导的是原因状语从句,还是时间状语从句?Now that I have come back,I want to help you both．现在既然我回来了,我要帮助你们两人. 温哥华是属于哪个国家的?拜托了各位 谢谢 I have been coming to Beijing for 15 years解释一下这句话的意思和用法,但是come不是短暂性动词吗？如果是“我来北京15年了”应该是have lived in Beijing吧 I _____ to your party,but I didn't have time.A.would have come B.could have come这题答案给的是B,但我觉得A更好. 我说的是 I will wait for your come back有人给我回了Etc who come Etc who come back什么 I have just come back.是现在完成时吗?如果是,那come为什么不用过去分词? 求特殊极限：1.lim(x->0) 2sinxcosx/(2x^2+x)2.lim(x->0) (tanx-sinx)/xcosx3.lim(x->0) (1+t/5)^(1/2t)4.lim(x->0) sin(sinx)/sinx5.lim(x->无穷) （1+2/x^2)^(x^2/4)我在温哥华上AP calculus所以洛必塔法则。i have no idea= = 这是assignme 我已经回到家了,翻译成英语是. I come from China.的同义句是?试卷上我写了I am from China.不对 I'm come back!有无语法错误,意思是我回来了（我已经回来）,那么m要不要换成was,come要不要换成came? 我如果不是在忙着找工作,也许就来看望你了.I would have come to visit you if I had n我如果不是在忙着找工作,也许就来看望你了.I would have come to visit you if I had not been busy looking for a job.would后面为什 1.All that I can do is to come _____terms with my fate.我选了in2.What have we said _____her so unhappy.make 我选了makes3.What a pity!I missed my father at the airport because my car was ____in the traffic jam.答案是held up 我选了kept back