啊

ā

1. interjection of surprise
2. Ah!
3. Oh!

à

1. interjection or grunt of agreement
2. uhm
3. Ah, OK
4. expression of recognition
5. Oh, it's you!

ǎ

1. interjection of surprise or doubt
2. Eh?
3. My!
4. what's up?

á

1. interjection expressing doubt or requiring answer
2. Eh?
3. what?

a

1. modal particle ending sentence, showing affirmation, approval, or consent