1.I stayed in Beijing for one and a half year.stayed 改成 have stayed 后面是for时间(持续时间多长),需用完成时
2.The manager asked his men not waste any more time.not waste 改成 not to waste
ask sb. not to do 动词不定式to不可省略 3.Geography plays a part of making dialects.of 改成 in, 在...事情中起作用用in,不用of4. Mom s