While she was trying to open the door, a light appeared at
the window and she screamed.Main clause:... a light appeared at the
window...
Main clause:... she screamed.
Adverbial clause of time:... she was trying to open
the door...Subordinating conjunction: While...
Co-ordinating conjunction:... and...Omitting relative pronouns
Like the subjects of clauses, relative pronouns can also
sometimes be omitted. They are ‘understood’ so the sense is
not lost. Leaving out ‘that’ can often ‘tighten’ your writing.
I chose the book (that) you recommended.
Here is the article (that) I enjoyed.‘That’ is unnecessary as both sentences can be understood
without it.
I chose the book you recommended.
Here is the article I enjoyed.WRITING NON SENTENCES
There are occasions when properly constructed sentences
are not used. When writing dialogue or using very informal
language, the rules will sometimes be ignored although the
words must still make sense.
60 / IMPROVE YOUR PUNCTUATION & GRAMMAR