Could you please let me know which one of the structure "wonder / was wondering" is more in common use in AE speech:
1) I wonder if / whether
used to ask politely for something [= may I]:
- I wonder if I might have a drink?
2) I was wondering if / whether
a) used to politely ask someone to help you:
- I was wondering if I could borrow your car?
b) used to ask someone politely if they would like to do something:
- I was wondering if you’d like to come to dinner.
Source: Longman Dictionary. I guess the only common usage in today's speech is '2a'.