下列各句中均有一处错误,请找出来并改正.急用!

题目

下列各句中均有一处错误,请找出来并改正.急用!
remember turning off your mobile phone when the plane takes off.
If you don't know the new word look up it in the dictionary.
We will go out and have a picnic if it won't rain tomorrow.
You will have an accident unless you will be careful.
求给力点!

答案

turning --to turn
look up it--look it up
won't --doesn't
will be --are