The machine must be in perfect working order.这里几个形

The machine must be in perfect working order.这里几个形 The machine must be out of order the machine must be out of order 有什么语法点? the machine makes strange______when it is working There must 填be动词：the washing machine ______ out of order the meeting in the next month would be perfect.这里可 Everything in the library must be put in a good ___( order , Payment must be enclosed with the order.Order without paymen Payment must be enclosed with the order. Order without payme The fire must be kept____through the night in order to keep 英语翻译In order to be considered what must be provided? there must be something seriously wrong with the machine