Letras de Summer Days Don't Die

English is not my first language but i'll still share what i think Henning is singing in this song.
Sadly there are some gaps in the text and i'm not sure about every word as i wasn't able to understand everything.
So if you understand more of the text or think i've made a mistake please correct me and add to the lyrics.

Summer days don't die my friend
they come back in the end
and if you try to undersand
what it ____ sun comes back again

summer days don't die
summer days don't die

summer days don't die my friend
they come back in the end
when winter winds are on your mind
think of the sun and/that you can find

summer days don't die
summer days don't die

when summer days have been replaced
and of the green that you've seen
__________________________
it's all about
it's all about
it's all about

summer days
summer days don't die
summer days don't die

keep breathing when the leaves are leaving
and in the end i'll ___
and oh/all you're meant to sing

summer days don't die
summer days don't die
summer days don't die

summer days oh