$#Cam$
` -> ` Ta chia thfi QKĐ
` -> ` ( + ) : S + V-ed / v2
` -> ` ( - ) : S + didn't + V nguyên mẫu
` -> ` ( ? ) : Did + S + V nguyên mẫu
` 6 ` saw
` -> ` DHNB : last night
` 7 ` did
` -> ` DHNB : last week
` 8 ` bit
` 9 ` did you get up
` -> ` DHNB : last morning