语法: （以）前

这些句子是否正确？谢谢

1. 在我去以前，请打扫厨房
2. 吃饭以前，孩子们洗手了吗？
3. 两年以前，你北京去了吗？
4. 日出前，我做了运动
5. 伤学前 ，我吃了早餐

Are these sentences correct? Thanks

1. Please clean the kitchen before I go
2. Do the children wash their hands before eating?
3. Two years ago, did you go to Beijing?
4. Before sunrise, I did some exercise
5. Before going to school, I had breakfast