Different phrases

[zaffar]

Dear Teacher,
I am giving you some phrases so as to confirm whether they are right or wrong.
1) Having understood the true nature of english language, I don't have this problem any more.(i guess this is "participle phrase")
2) The true nature of english language having understood, I don't have this problem anymore.
3) The true nature of english language having been understood, I don't have this problem anymore.
4) The true nature of english language having been understood by me, I don't have this problem anymore.
5) The true nature of english language being understood by me, I don't have this problem anymore.
6) Understanding the true nature of english language, I don't have this problem anymore.

Dear teacher, I want to know both the correctness and validity of this sentences and the exact differences in terms of meaning and aplicability of all of them.
Thanks in advance,
Zaffar

[Tdol]

1- fine
2-4- no
5- OK, but only just
6- OK

PS- 'the English language'.