If you post papers that you think are just about ready to submit, yes. We won't help edit rough drafts -- but we can help with editing/revision as well as final proofreading.
Here are some ideas to make sure you use before posting anything here for proofing:
Please go over your paper with the following in mind. Thanks to PsyDAG for the following:
... After writing your material, put it aside for a day — at least several hours. (This breaks mental sets you might have that keep you from noticing problems.) Then read it aloud as if you were reading someone else's work. (Reading aloud slows down your reading, so you are less likely to skip over problems.)
[You can also either read it aloud to someone else or have someone else read it aloud to you! The latter works really well!]
If your reading goes smoothly, that is fine. However, wherever you "stumble" in your reading, other people are likely to have a problem in reading your material. Those "stumbles" indicate areas that need revising.
Once you have made your revisions, repeat the process above. Good papers often require many drafts.
And here are some really good websites that will help, too: