will do be going to do used to do(过去常常) must do/mustn`t do have to do/don`t have to do It`s adj for sb. to do sth can/can`t shall/should及否定形式 may/might及否定形式 often seldom never always usually sometimes like to do need to do be supposed to do/be expected to do
一般将来时:将要发生的动作或存在的状态。 结构:【两种】①主语+be【be动词:am/is/are】 going to+动词原形 ②主语+will+动词原形 如:I am going to reading 一般过去时:过去某个时间发生的动作或存在的状态。 结构:主语+was/were+宾语 如:I was a professor 一般现在时:表示经常发生的动作或存在的状态。 结构:主语+be动词 如:I am a doctor 现在进行时:表示正在进行的动作 结构:主语+be动词+现在分词 如:I am reading a book