有關worry, worried, worrying的問題，thanks!

2) i am worry about ... --> plain wrong as "worry" is only a verb or a noun.

1) i worry about ...
3) i am worried about ...
4) i am worrying about ...

All the above three are correct with subtle difference.

1) you "actively" worry something
3) your worry (as a noun) is caused by an object
4) describing a state of your feeling

Consider and compare the difference in follows then you will see:

1) I walk.
3) I am walked to the door by my boss.
4) I am walking.

C How

1. "Worry" is a verb in simple present tense
2. "worried" can be a verb in past simple tense, or an adjective
3. "worring" in your example is a verb in present continuous tense.

Let me illustrate using some examples
1. " I worry about the exam". The focus is on how you think in your mind. You are very anxious about the exam.

2. "I am worrying about my career path" The focus is on the action you are performing , that is "worry".

3. "I am worried about the exam". The word "worried" here is an adjective describing your feeling. Or we can say "The exam makes me worried"

4. We don't have "I am worry ..."

All of them are means 使擔心,使發愁, excpet worrying means撕咬,嚙碎
Worry is present tense, e.x Don't worry about it.
Worried is past tense, e.x. I worried that these problem might be can't slove.
Worrying is continuous present tense, e.x I saw a cat worring a line.

I think....
"擔心 (某事)" is uesd 2) i am worry about ...