by
國小小四上/baɪ/
prep.藉由；在…旁邊；不晚於
used to show how something is done, or the latest time it happens
什麼時候用
交通工具用 by：by bus、by train，但「走路」是 on foot。
常見錯誤
- by foot ✗ → on foot ✓
- by 表期限（by Friday＝最晚星期五）
常見搭配
- by the way（順帶一提）
- by mistake（不小心）
例句
I go to school by bus.
我搭公車上學。
Finish it by Friday.
星期五前完成。