I has learnt English since ten years ago.
现在完成时I had learnt English by ten years.
过去完成时I will have dinner with him next Sunday.
一般将来I will have anexam next Sunday.
一般将来
He said thathe would go to Beijing next Sunday
过去将来
I learned English ten years ago.(过去)I had learnt English ten years before. (过去完成)Next Saturday I will eat with him. (将来)Next Saturday I will have an exam. (将来)He said he would go to Beijing next Saturday. (过去将来)