I would (give the money to the charity) if I had a million dollars(对括号内提问）
（what）（would）you do if you had a million dollars?
what will you do if it is rainy tomorrow?（同义句）
（what）（if）it is rainy tomorrow
If you are still nervous ,you needn't go（同义句）
If you are still nervous ,you（don't）（have）（to）go
He came to the party last night ,but he was late（合成一句）
He was（late）（for）the party last night
He doesn't know what to wear at the party（同义句）
He doesn't know（what）（he）（shoud）（wear）at the party