why

1.reason，consideration，explanation等词后面可以接以why引导的从句。例如：

• This is the reason why I did not go.
• There are many considerations why this work should be done.
• Now I have given sufficient explanation why the work should be done at once.

2.在以why开首的疑问句里的do you往往被省去。例如：

• Why spend such a lot of money?
• Why not go there with them?
• Why not apologize and ask his pardon?