I hope someone can rewrite my English..?

Question

I am a self Eng student. I appreciate if somebody can help me out my questions below.

How much did you give to buy this?
How much did you pay for this?
I bought this by $3
I gave 10 dollars to buy this
I paid $ 3 to buy this

I am falling asleep automatically as It is very warm here.
--> Are there other words replace of automatically?

Thanks..

Answer 1

I am a self taught English student and I would appreciate it if someone could help me out by answering the questions below:

How much did I pay for this? or How much did it cost to buy this?

How much did you pay for this? This is fine

I bought this for $3.00.

I paid $10.00 for this.

I paid $3.00 for this.

I keep falling asleep because it is very warm here.

Answer 2

You should have put "I am a self-taught English student" and not shorten it to "Eng."

Your first 2 questions are all right.
3. I bought this for $3 (instead of "by $3").
4. okay--you just wrote out the amount as 10 dollars instead of $10.
5..okay
6. Instead of using "automatically as" , put "I am falling asleep because it is very warm here."

Answer 3

I bought this for $3.
I paid $3 for this.
I gave $3 to pay for this

my concern is that you do not fall asleep automatically more like:

I cannot help but to fall asleep because it is very warm here.