But these minimal two-letter prepositions appear to be to build confusion. Here are a few rules that may help you have an understanding of when to implement in, on, and at within a sentence. （表达或书写的方式）用，以 Cheques really should be penned in ink. 支票要用墨水笔填写。 (frothy milk tea) anyplace to the island. http://139.59.255.83/