"While I don't necessarily think that friends and family are always the best resources for feedback - in many cases, they don't have the objectivity or the knowledge base to give you the most useful type of criticism - each friend is a unique individual and each friendship a unique relationship - and giving advice, support etc is often an essential part of a friendship.
My friends ask me for feedback on their work all the time. I give it happily and have never even thought about asking for money - even though some of these friends don't have the story sense to give me the same type of help in return. The friends I do approach for feedback have never expressed anything other than a total willingness and eagerness to do what they can to help me In fact, some of my friends get upset when I DON'T ask them to read an early draft.
One of the spec projects I've been working on has a high fashion photographer as a protag. I know nothing about high fashion photography and have turned to a photographer friend of mine on many occasions for information. This friend has never expressed anything but delight at the chance to help me out and share her war stories. If I offered her any more than picking up the tab for a meal - she'd be insulted - she's insulted when I insist on picking up the tab for the meal.
In friendship mutual support is a quid pro quo. If your writing is important to you - what kinda friend wouldn't want to help you out in any way they can?"
I'll tell you a story about two friends I know.
One friend had just been dumped by her boyfriend, fired from her job, and kicked out of her apartment. She turned to another friend and asked her if she could stay with her.
The other friend said yes. But the girl, upon moving in with her, apparently was depressed and slept a lot. So the girl who owned the apartment told her, "you've been hear one week and you've not made progress on finding an apartment or a new job" I'm kicking you out.
That friend felt that the depressed girl might end up staying with her for months and she didn't want the responsibility.
The point of the story is that your friend's patience and tolerance have limits. I do indeed have friends who are other writers. But I generally make it a rule not to critique their stuff. In part because I'm not really interested in it.
I certainly wouldn't help anyone with their English on a major project unless I'm paid $$$$$$$$. I see no reason to take out the time to help someone else with their work when I could be doing my own work.
It's my experience when dealing with friends the less you ask people for help the better. No one wants to carry anyone.
I had another so called friend who asked me to help him out query letters. And I told him to go to the library and get a book on it, and to go the post office and get some stamps. I saw no reason to help him on something he could easily do for himself. That would have been simply wasting my time.
Now don't get me wrong, I've read the work of some friends whose work I genuinely enjoyed reading. And a couple of friends of mine have read my work.
But asking someone to rewrite (localize) your dialoug is a JOB. You should PAY someone for that kind of work.
If someone who's language isn't English gets that kind of help from me or an another American, we could possibly save the drafts and sue them for a percentage of the script sale.
And yes, that is the only way I would help someone at that level, is if I were paid upfront and getting a percentage of the deal. Every other writer I've met has had the same attitudes, and many of these people are published and produced.
I'll also say if your work really needs more development, you might benefit from taking classes or attending seminars taught be produced screenwriters. That will be a lot more help than non professional friends could ever give you.