There is difference between . I didn't understand and I don't understood ?
Hello everybody . Help me please
There is difference between . I didn't understand and I don't understood
If There isn't difference..Which is the most popular?
Thanks.

Question

There is difference between .  I didn't understand and I don't understood ?
Hello everybody . Help me please
There is difference between .  I didn't understand and I don't understood 
If There isn't difference..Which is the most popular?
Thanks.

Answer

'I didn't understand' is a past tense
'I don't understand' is a present tense
'I don't understood' is incorrect

Answer

The answer could be, " I don't understand" (PRESENT TENSE) or 
"I didn't understand" (PAST TENSE)

Answer

Thank you!

Answer

I didn't understand what you said.
I didn't understand what you said yesterday, but I worked it out last night.

I (still) don't understand what Harry said.
I have never understood anything Ethan said, ever.