YOU SAID:
What are you doing since I heard giggling
INTO JAPANESE
笑い声を聞いてから何をしているの?
BACK INTO ENGLISH
What have you been doing since you heard the laughter?
INTO JAPANESE
笑い声を聞いてから何をしていましたか?
BACK INTO ENGLISH
What have you been doing since you heard the laughter?
You've done this before, haven't you.