we主语
provide谓语
summer english courses宾语
which are the best you can find 宾语从句
which指代“summer english courses”
you can find又是which are the best的从句
we主语
provide谓语
summer english courses宾语
which are the best you can find 宾语从句
which指代“summer english courses”
you can find又是which are the best的从句