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happen-happenning不应双写happeningdevelop-developping不应双写developingwait-waitting不应双写waitingwrite-writting去e不要双写writing rain-raninning不应双写rainingopen-openning,不应双写openingeat-eatting,不应双写eatingstudy-studing不应...

名词性物主代词相当于形物加名词，它只能单独使用后面不好加名词，分别是mine yours his hers its ours yours theirs。13. 介词 介词后要么不加动词，加动词只能加动词ing形式 如：be good at running;do well in jumping;14. ...