he had some knowledge/he have some knowlege. The difference.

问题描述:

he had some knowledge/he have some knowlege. The difference.
Please Explain with more detail.
he had some knowledge. 他曾经有一些知识. ( 言下之意 现在有还没有了).
he have some knowlege.他有一些知识.

补充:第二句应该为:he has some knowledge.不是have