For native and non-native English speakers (and for those like me who sometimes can't spell!), we have several excellent Writing Labs and Tutorial Centers on both campuses that can give you help with language and grammar:

https://english.santarosa.edu/writing-center

I’ve had students go and they speak highly of it. It’s free and you can drop in without making an appointment.

Also, here are a couple tools that might help you clean up your writing:
http://www.grammarly.com
http://www.whitesmoke.com

WRITING CENTER SERVICES

The Writing Center offers free, individual assistance for any writing assignment you have in any class. English instructors and instructional assistants are available for drop-in conferences to help you with any writing-related work, including: brainstorming essay ideas, developing a thesis, essay organization and development, using correct documentation format, and how to edit for grammatical and mechanical errors. The Writing Center also offers the use of computers for writing, research, and completing online learning modules. Students may print for free one copy of their own written work, such as drafts of essays, college transfer applications, scholarship applications, and other college writing tasks. (Please note, we can no longer support printing of class generated handouts, syllabi, articles, or other class materials. Printing is limited to student written work.)