Where are the choices? it says "which sentence correctly combines" but there are no choices.
The term dialect<span> involves the spelling, sounds, grammar and pronunciation used by a particular group of people and it distinguishes them from other people around them.</span>Dialect<span> is a very powerful and common way of characterization, which elaborates the geographic and social background of any character.</span>
The clause <em>when we can rest </em>is a subordinate/dependent clause, meaning that it cannot stand on its own - it has to be a part of a larger, independent clause, as is the case here.