我明白了应该是i understand it 还是 i understood it?

在口语中 表达我明白了是 I got 还是 I got it? I found it hard to understood I know ,I get it,I understand . 我明白了：I got,I got it or I see? 如果别人问Understand,我应该答yes,i do 还是got it? 我明白了为什么是You got it而不是I got it (Who,Whom) is on the phone?It is (me,I).这里应该是it is me 还是I,我看 既然你明白了,我不再过多解释了.【 】you【 】understood,I don’t have to explain 我拿到了是 I get it 还是 I got it?谁能帮我快速解答? 应该是I thought that it is a good book. 还是I thought that it was I wonder you can't understand it. 还是 I wonder you that can't 我喜欢这里应该是“I LIKE IT HERE”吧?