Student or Learner
Has David started ________?
No. He is waiting for Amy outside.
The key is either "out" or "along". But I can't find the latter and the former means "to begin your life, or the part of your life when you work, in a particular way" and I guess if I put "out" it means "start a journey". But what about "along"? Could you please explain that?
In another book it is "off", which can't be found in my dictionary. Could you please explain that to me?
Looking forward to hearing from you.
Thank you in advance.
You probably would not hear any of those in AmE. Instead, given the context you presented, you would probably hear "Has David left?' OR "Has David left yet?" OR "Has David left already?"