Thread:Topdarlingwh/@comment-8161155-20150927051333/@comment-10771297-20150927063836

Mr B Natural wrote: That quote from the grammar website you just gave began two sentences with "this". So "This is a production error." is a complete sentence. "This" is the subject, and "is" is the verb.

A complete sentence doesn't have to be something that someone could tell you without further information. If someone told me "Andy reads quickly." I would say "Who is Andy? What is he reading? Why is he in such a hurry?" It's still a complete sentence.

Certainly you didn't take the time to read carefully for: 1.Even if the word "This" in "This is a production error." was the subject there is no predicate.''' 2.When the verb is a form of "be," the sentence will require a word/phrase to make its meaning complete. see here 3.Do you not see that the '''only two phrases in that webpage with the word "This" are not complete sentences? They all finish with commas?''' 4. Andy reads quickly. This is a complete sentence as it contains a verb (reads), expresses a complete idea and it does not need any further information for the reader to understand the sentence.
 * This is now a complete sentence, <--
 * This is a complete sentence as it contains a verb (reads),<---
 * "Who is Andy? What is he reading? Why is he in such a hurry?" All superfluous information that could be detailed in a book or article of some sort.