I have been ------ the world.这个句子中------应该填什么呀?

I don't know when I have been loving lover、i won't love you until i have been 请问“I shouldn't have been here.”怎么翻译? i wouldn't have been +过去分词是什么时态?例句 i wouldn't have been scared anyways I have been selling I have been trying I have ever been I too have been I have been to. I have been I have been in. I have been to London.My cousin hasn't been to London,either.(同意句) Neither he nor I（ ）to Beijing.A、have been B、has been C、haven’t been D、hasn’t been 有没有这个说法:I mustn't have been a doctor.可以说mustn't`````吗? I have never been there.He hasn’t been there,either.(改为同义句）I have never been there._______　＿＿＿＿＿ he. have .since did区别have .since have done?eg：I haven’t seen you since I’ve been back.I haven’t seen you since I was back. I have been to Shanghai改为否定句,是这样写吗I haven't been to Shanghai How and what can I do I have been have no choice .I don't know how to say