Come on 可以表示“快点”“你可以的”或“真的吗”，用来催促、鼓励或表示不相信。说灯、暖气或机器时，come on 表示开始工作：The lights came on。感叹用法偏口语，不适合正式作文，但适合 Speaking 和日常交流。
想在对话中用 come on 吗？
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Come on! (hurry up / try harder); Come on, + sentence; Oh, come on! (disbelief); the lights/heating + come on
- Come on, we'll miss the train if you don't hurry.
- Come on, just one more kilometre and then we can have a rest.
- The heating comes on automatically at six, so the flat is warm when I get up.
修改原因
修改前Someone knocked on the door, and I called out, 'Come on!'
修改后Someone knocked on the door, and I called out, 'Come in!'
有人敲门时，用 Come in! 邀请对方进入。单独的 Come on! 不是通常的“请进”，而是在催促或鼓励。更热情地招呼人进来，也可以说 Come on in!
意思很大程度上取决于语调。愉快地说 Come on, you can do it! 是鼓励；拖长声音的 Oh, come on! 则可能表示不相信或不耐烦：Oh, come on, you don't really believe that。
动手练习
We're already late! ___, put your shoes on and let's go.
查看答案
Come on — 大家已经迟到，说话者要对方穿鞋出门，所以选表示“快点”的 Come on。Come in 是请人进来，而这里要离开家。
设想你在考试或面试前鼓励朋友。以 come on 开头，并说明为什么你认为对方会表现不错。
Come on, you've prepared for this interview for two weeks, so you'll be fine.
练习把新词用准确
用正在学的词造句。LetsWords 检查用法和语法，提供修改与母语解释，再通过复习巩固。