2016-2017学年 人教版 必修三 Unit 2 Healthy eating grammar 课件 (4)
2016-2017学年 人教版 必修三  Unit 2 Healthy eating  grammar 课件 (4)第4页

Our color TV set is still good enough. You needn’t have bought a new one.

4.needn’t have done 表示原本不必要做的事情却已经做了的情况,意为“本不必要…”

Your home is not far from your school ,so you needn’t have left in such a hurry then.