Writers need to use complete sentences because that is how readers understand the meaning of the text.
This is more difficult than it sounds. Our brain does not always play nice with our hands and fingers. What happens is, the writer has a thought, often complete in his/her mind, but when the writer puts pen to paper, or fingers to keyboard, the mind is onto the next thought before the hand has had a chance to get it down. So, the writer is left with an incomplete sentence, or what we in English Language Arts like to call, a fragment. To add to the difficult situation, when the writer re-reads his/her writing, the brain will sometimes automatically fill in the missing part of the sentence and trick the writer into thinking it is a complete thought. The writer may never notice that the sentence is unclear. So, what's a writer to do? First, the writer needs to remember that all sentences have a subject (who or what the sentence is about) and a predicate (what the subject did or does). The writer may need some help with making sure all the sentences are complete with a subject and predicate, and for that the writer needs to find another person to read the text. Reading out loud often helps. The reader can point out anything unclear to the writer for revision. When no other reader is around, the writer should take a brief break. Maybe go get a drink of water. Then, come back to the text, and at a slow, yet comfortable pace read the piece out loud. If something doesn't sound right, it probably isn't. This will give the writer an opportunity to fix any fragment sentences.
This is more difficult than it sounds. Our brain does not always play nice with our hands and fingers. What happens is, the writer has a thought, often complete in his/her mind, but when the writer puts pen to paper, or fingers to keyboard, the mind is onto the next thought before the hand has had a chance to get it down. So, the writer is left with an incomplete sentence, or what we in English Language Arts like to call, a fragment. To add to the difficult situation, when the writer re-reads his/her writing, the brain will sometimes automatically fill in the missing part of the sentence and trick the writer into thinking it is a complete thought. The writer may never notice that the sentence is unclear. So, what's a writer to do? First, the writer needs to remember that all sentences have a subject (who or what the sentence is about) and a predicate (what the subject did or does). The writer may need some help with making sure all the sentences are complete with a subject and predicate, and for that the writer needs to find another person to read the text. Reading out loud often helps. The reader can point out anything unclear to the writer for revision. When no other reader is around, the writer should take a brief break. Maybe go get a drink of water. Then, come back to the text, and at a slow, yet comfortable pace read the piece out loud. If something doesn't sound right, it probably isn't. This will give the writer an opportunity to fix any fragment sentences.