Lesson 1 难句解析

　　I don't know what your expectations are of London, but knowing that you've never travelled outside of Asia, I thought I'd tell you a bit about what you can expect to find. (P36)

本句是由but引导的并列复合句。前一分句中宾语从句 what your expectations are of London的正常语序应该是：what your expectations of London are，把of London后置是为了避免句子"头重脚轻"；后一分句中的主干结构是I thought I'd tell you ．．．, 现在分词短语knowing that ．．． Asia作状语，表示原因，相当于since I know that ．．．。

这个句子的主要意思为：I don't know what your expectations are, but let me tell you what to expect.