Question about questions

[LiScing]

Are these all correct ways to ask, "Have you ever been to Taiwan?"

你去過台灣嗎？

你去台灣過嗎？

你去過了台灣嗎？

你有没有去過台灣？

Some of them are more awkward than the others, but are they all grammatically correct?

[skylee]

I would use the first and the last ones. If the 了 is placed after 台灣, the third one is also ok.

[Farkas]

The first and the last are all right.They have the same meanings,but the second and third sentences are both wrong

[LiScing]

Thanks.

How about asking if someone is hungry?

1. 有没有餓？

2. 是不是餓？

and.....beautiful?

3. 有没有漂亮？

4. 是不是漂亮？

Which ones are correct?

[LiScing]

Searching with Google, I find 有没有餓？

being used. This is strange to me because 餓 is an adjective!

[renzhe]

I'd say:

你饿了吗?

and

她漂亮吗?

2 & 4 are definitely wrong, and 1 & 3 sound extremely odd.

Simpler is often better

[yonglin]

If you're really fond of the positive-negative structure, it is grammatically correct to say

你饿不饿？

她漂亮不漂亮？

I think the first one sounds okay, but not as smooth as the 吗 structure. The second one sounds quite awkward (to my non-native ears).

[Farkas]

你饿了吗？ （不知道对方是不是饿了，询问对方）

你是不是饿了？ （通过对方的表情，或是长时间没有进食，推测对方饿了，也表示询问）

[semantic nuance]

How about asking if someone is hungry?

1. 有没有餓？

2. 是不是餓？

Perhaps 有沒有餓 is grammatically inappropriate. However, orally, we do say 有沒有餓了啊/ 呢? (influenced by Taiwanese, I guess) or 是不是餓了啊/呢? Also, you can say 會不會餓啊/呢?

and.....beautiful?

3. 有没有漂亮？

4. 是不是漂亮？

Once again, 3. is orally used.

Answers suggested by renzhe and yonglin are correct, too.