Understand or understood?

[aina@hana]

Hi Toreston and everyone,

Thanks for God, luckily i managed to found this website. I found this website is very interesting and give me more knowledge in terms of grammar.
My name is hana@aina and i'm from Malaysia and. Does anyone of u ever been to here before? ; ) There's so many awesome places to visit here ; )
Referring to the question that u asked before, I could understand of what Sue Darville is trying to say but due to slang used by overseas people, i need to repeat the recording for 3 times....; (
By the way, may i know what is the difference between understand and understood?
When people i asked me whether i understand one particular topic or not...which word is correct to use?
I understand or i understood?
I admit my grammar is not good. Kindly correct it if i'm wrong.
Thanks you.

[Honey2]

understand is a present.
Understood is a past.
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live quite life

[Alan]

Hi,

If someone asks you whether you understand what they have explained, you have two possible replies: Yes, I understand or Yes, I have understood. Both refer back to the question someone has asked.

Alan
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English as a Second Language
You can read my ESL story Present Simple