介词是英语词类大家族的成员之一,它经常被人们所忽略,然而它却是英语短语或句子结构的重要组成部分。在一些相同的英语短语中,由于介词的不同,其含义差别很大,现列举如下:11.be good at,be good to,be good for,be good with(1)be good at意为“擅长”。如:He is good at studying English. Prepositions are one of the members of the English word family and are often overlooked, yet they are an important part of English phrases or sentence structures. In some of the same English phrases, due to the different prepositions, its meaning is very different, are as follows: 11.be good at, be good to, be good for, be good with (1) be good at meaning “ Good at ”. Such as: He is good at studying English.