本讲为2006年下半年新的教学内容，请对照教材、练习册和语法书听声音。

If …, …

Would should could might
Were to do
If I got the information, I __ (let) you know.
If there were not air,

The boss suggested that he __ from the others.
Learned learn learns learning
It is time to go to school.
It is time that you went to school.