Conditional statement, hypothesis, and conclusion
Another name for an if-then statement is a conditional statement. Every conditional has two parts. The part following if is the hypothesis and the part following then is the conclusion.
A conditional statement is a statement that is usually in the “if-then” form. It is used to express unreal or possible situations. Conditional statements are made up of two parts; the part that follows if (hypothesis or conditional part), and the part that follows then (the main part or conclusion). When writing a conditional statement, the order of arrangement of the two parts is not important but a comma should be used to separate them.
Explanation:
was the only one present who had said nothing. For some time he had sat silent beside Bilbo's empty chair, and ignored all remarks and questions. He had enjoyed the joke, of course, even though he had been in the know.