The best thing you can do go keep a positive relationship with your supervisor is

right angles are formed by perpendicular lines. if the lines would extend, to make two intersecting lines, they would form four right angles.

sing because that is what they are doing in the sentence

explanation:

the simple predicate is the main verb in the predicate that tells what the subject does. example: my father fixed the dryer. read each sentence. draw a line under the complete predicate.