Student or Learner
a. He chose me because I am fast, not strong.
Can't this sentence have two different meanings?
1. He chose me because I am fast, not because I am strong.
2. He chose me because I am not strong but fast.
PS. I think it means (1), but it is not clear whether the speaker considers himself or herself strong or not. I think it could be either. You have the same ambiguity in (1).