1.主语从句：Where we will have a picnic is unknown.我们到哪去野餐还不得知.
2.地点状语从句 They built a factory where there is plenty of water.他们在水源充足的地方建立了工厂.
3.定语从句They built a factory at the place where there is plenty of water.他们在水源充足的地方建立了工厂.
4.同位语从句 I have no idea where we can get so much money.我不知道我们到哪能弄到那么多钱?
5. 表语从句This is where Tom was born.这就是汤姆出生的地方.
6. 宾语从句I want to know where we will have a picnic this weekend.我想知道我们这周末到哪去野餐.