What is the purpose of the first sentence of a paragraph?

to provide an introduction
to state the main idea
to give a transition
to change the focus

What is written in the preamble to the constitution? a. a list of reasons why the constitution was written b. the consequences of and penalties for ignoring the constitution c. a list of new laws added to the constitution accompanied by detailed explanations d. a guide explaining how to interpret and navigate the constitution

My friends asked me, “are you not coming for the party? "change into passive voice

If the author's last name is mentioned in the sentence, it does not need to be included in the in-text citation.