281 wake sb up 把某人叫醒282 want to do sth 想做某事283 watch sb do sth 观看某人做某事284 welcome to （地方） 欢迎到285 what about n /doing eg : what about an apple 286 what if 假如如何解决 What if 句子 eg : What if it is true ? 若是真的如何解决？What if aliens should come to the earth倘若外星人来到地球如何解决？287 what they will do = what to do 288 Whats the matter ? = Whats the trouble ?= Whats wrong ? 有哪些困难？289 while 延续性动词290 why dont you do = why not do
