understand的过去式和过去分词形式是：understood,
v.懂;理解;领会;了解;认识到;明了;谅解;体谅；
例句：
I understood little of what he said.
我几乎听不懂他所讲的。
I've never really understood what makes her tick.
我从未真正弄懂她为什么这么做。
His decision can only be understood in context.
只有了解来龙去脉才能明白他的决定。
Can you make yourself understood in Russian?
你能用俄语表达你的意思吗？
The causes of the phenomenon are still incompletely understood.
造成这种现象的原因尚未彻底弄清。
It is understood that the band are working on their next album.
据说这个乐队正在录制他们的下一张专辑。
She understood the importance of establishing a close rapport with clients.
她懂得与客户建立密切和谐的关系的重要性。
温馨提示：
