join two sentences into one, use because/ since/ as
1. Lan and Ba never go camping, so they don't have a tent
2. I stay at home, It rains
3. Tan is late for school. He misses the bus
4. The weather is fine. We have a picnic on the mountain
5. I don't have a bike, so I walk
6. Nhan is free, so he flies his kites