Rules for Using “That” to Join Two Clauses
One of the problems with grammar today is which source is reliable. Perhaps, writing sentences today depends on who read them. For example, offline, it is considered correct to use “that” to join two clauses. Online content usage of “that” to join two clauses depends entirely on which style guide is used and whether browser algorithms accept it. The use of “that” may also depend on the dictates for brevity and white space when writing for magazines or newspapers. Online content relies mainly on AP and API to determine correctness of the use of “that” to join two clauses. However, it would be prudent for students writing term papers and a college thesis to check the standard style guide preferences. It is important to note that AP is not precise about use of “that”
Examples of “That” to Join Two Clauses
I designed a car that I presented to the public.
In this example, it is imperative to use “that.” The alternative would be unclear as two separate sentences: I designed a car. I presented to the public.
“That” is often used as a relative pronoun in which case, it can be dropped without compromising articulation of thought.
Perhaps, the rule of thumb is to drop “that” if it isn’t necessary unless the style guide in use states otherwise. The best idea to follow is to keep in mind who reads what you write and adapt your writing style accordingly. Writing styles are generally formal or casual.