There are many books available on grammar and writing, but few people use them. When a proposal or manual has to get out of the door fast, referring to a handbook on writing is probably the last thing on your mind. Grammar checkers such as Grammatik or Correct Grammar can help, but more often than not, they are tedious to use. The passive voice should never be used. Do not put statements in the negative form.
Verbs have to agree with their subjects.
Proofread carefully to see if you words out. If you reread your work, you can find on rereading a great deal of repetition can be avoided by rereading and editing. A writer must not shift your point of view. And don't start a sentence with a conjunction. Remember, too, a preposition is a terrible word to end a sentence with.