（be的第一人称单数现在式；口语中常略作’m；否定形式为I am not和I'm not；反意疑问句中形式为aren't I）
Am is the first person singular of the present tense of be .Am is often shortened to 'm in spoken English. The negative forms are 'I am not' and 'I'm not'. In questions and tags in spoken English, these are usually changed to 'aren't I'.