YOU SAID:
for labs went to a blab and sat on my lap
INTO JAPANESE
ラボはブラブに行って膝の上に座っていた
BACK INTO ENGLISH
Lab went to blab and sat on lap
INTO JAPANESE
ラボはblabに行き、膝の上に座った
BACK INTO ENGLISH
Lab went to blab and sat on knee
INTO JAPANESE
ラボはblabに行き、膝の上に座りました
BACK INTO ENGLISH
Lab went to blab and sat on knee
You've done this before, haven't you.