Learn Russian or Ukranian...... I have enough trouble with American English!
Just a couple of pointers:
'...At free time I learn English ...' Grammatical error, should read 'In my free time I learn English'.
'...but I know need more practice...' Common mistaken word, should read 'but I now need more practice'.
Know - (pron. n-o) = To be aware of.
Now - (pron. n-ow) = The present point in time.
eg = '...but I know I now need more practice.'
'So I've thought may someone else learn Russian or Ukrainian and have the same problem.'
A few errors here, depending on what you wanted to communicate and how you wanted to present it =
'So I thought maybe someone else who is learning Russian or Ukrainian is having the same problem.'
'So I've thought perhaps if someone learning Russian or Ukrainian, who is having the same problem....'
But, to be quite frank, your English is perfectly understandable. I've seen English and American people posting here with a far worse command of the English language than that which you have displayed.