Rewrite the sentences using needn't have and didn't have to.

1.It wasn't necessary to confirm the reservation, so he didn't.

He didn't need to confirm the reservation.

2.She phoned her friend to tell him the news about Jim, but he already knew it.

She needn't have phoned her friend to tell him the newa about Jim.

3.I took my mobile phone on a skiing holiday, but it didn't work in the mountains.

I needn't have taken my mobile phone on a skiing holiday.

4.The museum was free yesterday, so we didn't pay to go in.

The museum was free yesterday so we didn't need to pay to go in.

5.She spent hours doing her hair in a special style then decided to wear a hat, so doing her hair was a waste of time.

She needn't have spent hours doing her hair in a special style

Is this right