Thread:Topdarlingwh/@comment-8161155-20150927051333/@comment-10771297-20150927061653

I have never heard a person say "This is a production error." Anyone would respond by saying "What is a production error."

A complete sentence always contains a verb, expresses a complete idea and makes sense standing alone.

"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.

When Andy reads is an incomplete sentence. It contains a verb, but the opening word when tells us that something happens when Andy reads; we need more information to complete the idea.

When Andy reads, he reads quickly. This is now a complete sentence, as the whole idea of the sentence has been expressed...."

http://libweb.surrey.ac.uk/library/skills/Grammar%20Guide%20Leicester/page_02.htm