. It was not necessary for Nancy to clean the flat. (have to) => ………………………………………………………………………………

It was not necessary for Nancy to clean the flat. (have to)

⇒ Nancy doesn't have to clean the flat

⇒ Not necessary: không cần thiết

⇒ have to: phải

⇒ không cần thiết → không phải ⇔ not necessay → không phải làm

(+) has/have to + V

(-) doesn't have to + V

(?) does/do + S + have to + V

$#thanhmaii2008$