1. Uncle boght a bike for me.

(Can we use'uncle' without 'a article'?)

2. A: You look sick. Why do you look sick?
B: I have a head ache.

(In this short dialogue, is the expression,"Why do you look sick?" suitable here? What other expressions can we use?)

3. It was so beautiful.
The weather was so beautiful.
It was very beautiful.
It was too beautiful.

(Are they all correct? Can we use 'so, too, very', interchnangiblly?)

4. She usually goes to bed at ten, _____ she goes to bed around eleven on Saturdays.

(Which conjunction can we use in the blank, and, or not? Are both OK?)

1. My uncle bought a bike for me.

(You wouldn't use "a" with "uncle," but you need to either name him or put a possessive pronoun or some other modifier with it. If you name him, you'd write, "Uncle Robert bought me a bike.")

2. You could say, "You look sick. What's the matter?" or "You look sick. What's wrong?"

And "headache" is written as one word.

3. They are all correct, but whenever you use "so" there needs to be some clause starting with "that" following it. "It is so beautiful that I want to spend the whole afternoon outside." (Or something like that.)

4. I would use "but" as the conjunction in that sentence. You are setting up a contrast, so the conjunctions you listed wouldn't work.

1. In English, it is common to use the article "a" before a singular countable noun. So it would be grammatically correct to say "Uncle bought a bike for me." However, in informal speech, sometimes people omit the article "a" in front of family titles, like uncle, aunt, mom, etc. So it would also be acceptable to say "Uncle bought me a bike." Both versions are commonly used.

2. The expression "Why do you look sick?" is suitable in this context. It is a direct and straightforward question to inquire about the reason for someone's appearance of being sick. Other expressions that can be used to ask a similar question include:
- "What's wrong? You seem unwell."
- "Are you feeling okay? You don't look well."
- "You appear sick. Is there a reason?"

3. All the given sentences are correct, but they convey different degrees of intensity in describing the beauty.

- "It was so beautiful" emphasizes a high level of beauty.
- "The weather was so beautiful" specifies that the beauty refers to the weather.
- "It was very beautiful" indicates a general level of beauty.
- "It was too beautiful" suggests that the beauty was excessive or overwhelming.

While "so," "too," and "very" can be used interchangeably to some extent, they do have slight differences in meaning. "So" emphasizes a high degree, "too" suggests an excess or going beyond what is expected, and "very" simply indicates a high level without implying excess or emphasis.

4. In the given sentence, the conjunction "but" would be appropriate in the blank. It would make the sentence read as follows: "She usually goes to bed at ten, but she goes to bed around eleven on Saturdays." The conjunction "but" is used to show a contrast or exception in the sentence.

Alternatively, if you wanted to use other conjunctions, you could say:
- "She usually goes to bed at ten, although she goes to bed around eleven on Saturdays."
- "She usually goes to bed at ten, whereas she goes to bed around eleven on Saturdays."

Both "but" and "although/whereas" are acceptable options to indicate a contrast between the usual bedtime and the bedtime on Saturdays.