there is a big old tree behind my house和there was a big old tree behind my house的区别

问题描述:

there is a big old tree behind my house和there was a big old tree behind my house的区别

意思都是“在我房子的后面有一颗很大的古树”
第一句指现在的情况
第二句指过去的情况(现在不一定有了)