相信每个小朋友的老师或者家人在你上小学的第一天起就会告诉你：“每天要按时到校，放学及时回家。”那这个“按时”和“及时”都该怎么用英语表达呢？
1. 按时——on time
(1). You should get to school on time.
你应该按时到校。
(2). Please hand in your homework on time.
请按时交作业。
(3) Mom, can you pick me up on time?
妈妈，你能按时来接我吗？
2. 及时——in time
(1). If you need help, please call me in time.
如果你需要帮助，请及时给我打电话。
(2). Luckily, he called the police in time, the little child was finally saved.幸好他及时报警，那个小孩子最终得救了。
3. 提前——ahead of time
(1). I can finish the work ahead of time.
我能提前完成工作。
(2). Please let me know the details ahead of time. 请提前让我知道细节。