Have you been to Beijing before?/你以前來過北京嗎？
A: David, have you been to Beijing before?
A: 大衛(wèi)，你以前來過北京嗎？
B: Yes, I have. Many times.
B: 是的，來過。來過很多次。
A: Really? You must know it quite well.
A: 是嗎？你一定非常了解北京。
B: Well, I think this is my sixth visit. I get to know it a little bit more each time.
B: 哦，我想這是第六次來北京了。我一次比一次更了解它。
A: Six tmies! That's a lot. It's nearly your home city!
A: 六次！不少啊。差不多成了你的家鄉(xiāng)了！
Notes:
1. To ask someone if they have done something in the past, you can say: Have you been to Beijing before; Have you seen the GREat Wall? 如果問某人在過去是否做過某事，你可以說：Have you been to Beijing before? (你以前去過北京嗎？); Have you seen the Great Wall? (你見過長城嗎？).
2. You must know it quite well. You can use this expression you must...when you think something for certain, e.g. after a long busy day: You must be tired. 你一定對它非常了解。當你非常確定某事時，你可以用下面這個表達法：You must...(你一定...), 例如：在某人忙碌了一天之后說：You must be tired (你一定累了)。
A: David, have you been to Beijing before?
A: 大衛(wèi)，你以前來過北京嗎？
B: Yes, I have. Many times.
B: 是的，來過。來過很多次。
A: Really? You must know it quite well.
A: 是嗎？你一定非常了解北京。
B: Well, I think this is my sixth visit. I get to know it a little bit more each time.
B: 哦，我想這是第六次來北京了。我一次比一次更了解它。
A: Six tmies! That's a lot. It's nearly your home city!
A: 六次！不少啊。差不多成了你的家鄉(xiāng)了！
Notes:
1. To ask someone if they have done something in the past, you can say: Have you been to Beijing before; Have you seen the GREat Wall? 如果問某人在過去是否做過某事，你可以說：Have you been to Beijing before? (你以前去過北京嗎？); Have you seen the Great Wall? (你見過長城嗎？).
2. You must know it quite well. You can use this expression you must...when you think something for certain, e.g. after a long busy day: You must be tired. 你一定對它非常了解。當你非常確定某事時，你可以用下面這個表達法：You must...(你一定...), 例如：在某人忙碌了一天之后說：You must be tired (你一定累了)。