1种we should take a cab,because we are late.2种Les go by taxi for we are running out of time.Must we go tothe train station on foot?No we can go by bus.
there is no need to hurry.we still have half an hour.
we do not go in a hurry,we still have half an hour.
take your time,we still have half an hour.Marry must stay in bed,because she isill.
you do not have to wait forher.you need not wait for her.there is no need for you to wait for her.