英语翻译

英语翻译
you may get fined if you give somebody a lift on your bike.
we may not be able to find the machine we need.
she said she might not be able to come to themeeting.
i thought the book might be too difficult for us.
you needn't copy out the whole text.
we ought to give them as much help as we can.
you ought to have told us about your difficulties.
i should be more careful next time.
may i start the machine now?
no,you mustn't.they haven't finished repairing it.
must i stop the machine when i change the speed?
yes,you must.but you needn't switch off the power.