短句合成一个长句,
问题描述：
短句合成一个长句,
1.this is a good spot for a picnic
2.a river flows on one side
3.a large tree provides shade
4.we can spread our blanket on the grassy knoll
答
This is a good spot for a picnic where we can spread our blanket on the grassy knoll,a large tree provides shade and a river flows on one side.