Is the following a sentence or a fragment? received your letter this morning.

Fragment

Explanation:

This phrase is a fragment because it lacks a subject, which is one of the most important requirements of a sentence. Without a subject, we have no way of knowing who is performing the action described by the verb. Therefore, in order to turn this fragment into a sentence we would need to add a subject, such as "I," "he/she," "we" or "they."

i guess you are missing the idea that has to be supported, am i right?

b. cronkite, a trusted television personality, declared that the war was unwinnable and told the american people that the government had better find a way out

even though it went against everything the news anchors typically stood for, cronkite voiced an opinion and took a stance, telling the us that there was no way they were going to win, the war was going to end in a stalemate.