Proofreading and correcting your own work can be much harder than correcting the work of others. That is because when we re-read our own work, we tend to hear what we intended to write, not what is actually written. To correct a sentence, whether you wrote it or not, you should fully understand what is expected to be in a sentence. It should be a complete thought that does not need input from anything else. It should include a verb and subject. As you progress, this will become second nature.
Sentences should all pass the smell test. The test I speak of is the common characteristics of a well written sentence. Which starts with no mistakes in grammar structure or mechanics. You can check this by reading it slowly to yourself and making sure it reads and you would say it. A sentence should start with a main point and get that across to the audience. A well written sentence is easy to read and rolls softly in an understandable manner. This selection of worksheets will see if you can complete or identify sentences that knock it out of the park.