Help to write pa svenska

I can write also "han knack' på dörr". Is this version correct grammatically?

Well.... there are some problems with all of those, because they might not convey the meaning you're after.

"Han knackar dörr" means "he goes door to door", as in someone who's trying to sell something. Like a travelling salesman, or a Jehova's Witness.

"Han knackar på dörr" would translate to "he knocks on door". That's just not correct. It might work, claiming poetic license, but a Swedish speaker would just think it's weird and wrong. 

"Han knack' på dörr".... well, now you're from my father's home town of Piteå, and if you don't write the whole song in Pitemål or another dialect from northern Norrland it just looks like a strange form break.

What are the lines connecting to this one? Would you perhaps need a different translation altogether? 

Thank you for your comment! But I am surprised that even "han knackar pa dorr" is incorrect. How I could say if somebody wants to entry door? Han knackar på dörren? (this is automated translation) Or "han knackar min dörren"?

Hi!

"Han knackar på dörren" is correct, but I wonder if the flow or rythm in the song needs another translation, if you know what I mean?

BTW: Sorry if my english isn't entirely correct.

This is the translated verse which I want to put into necessary rhythm

Ensam duva på taklisten utanför fönstret
Tittar på mig, knackar på huset
Kanske kommer du också till mig
Du kommer att förstå allt, du kommer att förstå allt

And my version is 
Den ensamma duvan i en kyla utanför
Tittar den på mig och knackar dörr
Kanske kommer du till mig också
Du ska förstå, du ska förstå

It is not possible to change the length of sentences because of rhythm requirements. 

Can't you just use the first version?

En ensam duva på fönsterblecket utanför
Tittar in på mig och knackar på
Kanske kommer du till mig också
Du ska förstå, du ska förstå

"Knacka dörr" is more like an idiom that suggests randomly knocking on doors to ask questions or whatever. "Knacka på dörr" is not correct. You can say "knacka på en dörr" (knock on a door) or "knacka på dörren" (knock on the door).

Thank you very much. I like it. Nevertheless "En ensam duva" is not so good. It has 5 vowel sounds, but I need 6. Is correct the phrase "Den ensamma duvan"? It has necessary 6 vowel sounds.

Okay. I tried to translate another verse.

This is my translation:

Då kan inte jag förstå, vad jag gjorde fel mot dig
Ville vara jag din vän, förstår du mig
Du gick ut och stängde dörr, en snöstorm är i din själ
Om något går fel, min vän, förlåt du mig.

This translation has perfect rhythm but probably is incorrect grammatically.
 

These are two automated translations made by google and yandex, respectively

Än förolämpad dig, vad gjorde jag, säg mig
Jag ville vara din vän, förstår
Du gick och slängde dörren och en snöstorm sveper i din själ
Om något går fel, förlåt mig

Vad har jag gjort för att förolämpa dig, vad har jag gjort, berätta för mig
Jag ville vara din vän, förstå
Du lämnade, smäller dörren, och i duschen sveper en snöstorm
Om något är fel, då är jag ledsen

I think that "själ" is more correct translation

I sort of wished my russian was better, so I could help you out better. It feels to me that your approach is wrong on a fundamental level. It feels like you're trying to translate the words as they stand instead of the meaning the song conveys, if you understand my meaning. Is this perhaps because you don't know Swedish?

I agree that I do not know Swedish good. However it was interesting for me to translate into Swedish. You said that you know Russian? It is great.
????? ??? ?????????? "???????? ??????", ? ? ???? ?? ????????? ?? ????????. ?? ?????? ??? ?????? ??? ???? ????????? ??? ???????? ?????.

There is the problem with cyrillic letters here. I would be greatful if you write me on my mail fionov@mail.ru

Yes, "Den ensamma duvan" is correct also. It means "the lonely dove" while "En ensam duva" is "a lonely dove".