句型转换

1. I saw Susan in the morning on my way to school.(强调时间状语)

                                                        saw Susan on my way to school.

2. My mother bought me an MP3 as my birthday present.(用强调句型来提问画线部分)

                                  your mother bought you as your birthday present?

摩擦分为滑动摩擦和滚动摩擦两种。（）