2. Five glasses of beer, please. Chị cho năm chai ly bia.

chai = bottle.

You're very good!

5. He is not only a writer but also a poet. Ông ấy không những là nhà văn mà còn là nhà thơ.- (Formal speaking)

Informal speaking: Ông ấy vừa là nhà văn vừa là nhà thơ (Structure "không những....mà còn" is usually used in written Vietnamese. I don't hear ppl say this structure of sentence much in a daily conversation. 

6. While watching TV I drink tea. Tôi vừa xem TV vừa uống trà.

Informal speaking: Mình/em/tao vừa xem TV vừa uống trà.

7. Hello, can I speak to Mr. Van please. 

Formal speaking: Hello, can I speak to Mr. Van please.Xin chào. Tôi có thể  nói chuyện với ông Van được không?/ Xin chào. Làm ơn cho tôi nói chuyện với ông Van.

He has gone. Would you like to leave a message? – Ông ấy đã đi rồi. Chị có muốn nhắn gì cho  ông ấy không?
No, thanks. I will call him later. – Không, cám ơn chị. Tôi sẽ gọi lại sau.

Informal speaking: Chào Anh/Chị/Bạn. Em/Mình có thể gặp ông Vân được không?/ Anh/Chị/Bạn cho em/mình gặp ông Vân được không ( Even though it was a phone conversation in this situation, Vietnamese often use the verb "gặp" to speak to someone)

8. They are talking during walking on the street. Họ vừa nói chuyện vừa đi bộ. (Formal speaking)

Informal speaking: Depend on the type/appearance/ the relationship between "họ" and you that you can decide how to address them. The most common way to say" they" in a native way could be " Mấy người đấy/ Mấy cái người đấy"; to someone who is older than you could be "mấy ông bà/anh chị đấy"

I couldn't include all the way native speakers usually say here because sometimes everyone has their own ways of saying something depends on their habits, region and local dialect. So if you hear a native speaker says something which is not the same as the way you learned, try to imitate them and i think that 's the best way to sound more natural. I hope these will help! I'm not a English native speaker so i may make some mistakes in the answers. Please correct me if you find any and let me know if you have any questions :)! Thank you!

Linnie

Hi Lisa,

You did a great job!!! Your translations are almost right, except some minor mistakes. However, as a beginner in the 3rd language, i figured out when we learned a new language, we usually learned the formal forms of it and that makes us ended up sounding like "a foreigner".From your notes, I'll assume that you're an advanced learner so I think you should start to know the way native speakers say. Below are my translations in both formal and informal ways (the way native speakers say).   Of course, this is my personal opinion that we should try our best to be "near native" as much as we could. If you don't share the same opinion with mine, that's fine, but knowing is better than not knowing, right :)))? Hope these will help!

1. Please, give me a menu. 

Formal speaking:(could be used in written Vietnamese) " Làm ơn cho tôi xem thực đơn" ("Cho xem thực đơn" sounds rude to me)

Informal speaking (native speakers say on a daily basis) :" Chị/Anh/Bạn ơi, cho em/mình xem thực đơn được không (ạ)" Dont forget the "....ơi" part. If you're ,by any chance, living in a VNese community, you'll see ppl say that all the time. Adding "ạ" to the end of a sentence will make you sound more polite ( should be used to talk to whom you think is older than you).

2. Five glasses of beer, please. 

Formal speaking: Làm ơn cho tôi 5 ly bia. (Remember "tôi" sounds really formal and unfriendly in a daily conversation. Native speakers most likely use "tôi" in written VNese, or sometimes, when they're quarreling with others. Or in a formal situation (like a meeting), the older person would call himself "tôi" and call the younger person " cô/cậu" (female/male).

Informal speaking:  Chị/Anh/Bạn ơi, (có thể) cho mình 5 ly bia đi (được không)?

3. Like father like son. Chà Cha nào con nấy.

4. An accident happened immediately after his arrival. Sau khi anh ấy đến,sự cố xảy ra ngay. 

Formal speaking: sự cố xảy ra ngay ngay khi anh ấy đến ( immediately means "ngay khi"; after means "Sau khi")

Informal speaking: Anh ấy/nó vừa đến thì sự cố xảy ra ngay/luôn. ( "nó" is the casual, impolite (to someone who's older than you) way to call other people; can be used for both male and female)