1.表时间： 意为：到.时候为止 We’ll have finished the work by ten o’clock. 2.表交通方式： 意为：乘坐某种交通工具 He came here by sea/ plane/bus. 3.表方位： 在.附近 We often go out for a walk by the river. 4.表方式 用某种抽象的方式 You can learn English well by doing more listening,reading. 5.觉得有用就给个最佳,欢迎来问.
