"What did you do yesterday?"
I'm having trouble understanding this sentence. It might be because I am really tired.
きのう(は) - yesterday 何(を? )- what しました(か) - do?
Consequently, typing this out helped me figure it out lol. Maybe it'll help someone else that is sleep deprived and or confused on the break down of the sentence. I realized now that when I answered this question, i forgot to put that first し, and that messed me all the way up.
[きのう] [は] [何] [を] [しましたか]? [Yesterday] [<-(subject)] [what] [<-(topic)] [you (<-implied) did]?
[は] is [-(topic)] and [を] is [-(object)]; the implied "you" is the subject.
("What happened?" "Somebody did something." "Then did is the verb. Who did?" "You." "Then you is the subject. What was it that you did?" "Errr... What, I guess." "Then what is the object.")
It's a verbal question mark. It goes at the end of all questions. (On duo at least. In real speech, it's often dropped and people just use a rising tone at the end of the sentence just like questions in English.)
No, because you need きのう. If you just say 何をしましたか. You are basically saying, "What did you do." The question is, "what did you do Yesterday." きのう adds that missing "Yesterday"