Question

a. the dog is fast. auxiliary or copular
b. the student was thinking. auxiliary or copular
c. the soccer player will score goals. auxiliary or copular
d. the animals are cute. auxiliary or copular
e. mr sherzad is my teacher. auxiliary or copular
f. those headphones were expensive. auxiliary or copular
g. my refrigerator is running. auxiliary or copular
h. the astronaut will fly the rocket. auxiliary or copular

Explanation:

To determine if the underlined verb is auxiliary or copular, we analyze each sentence:

• a. "The dog is fast." "Is" links the subject "dog" to the predicate adjective "fast" (describes the subject), so it's a copular verb (linking verb).
• b. "The student was thinking." "Was" is used with the main verb "thinking" (participle) to form the past continuous tense. So "was" is an auxiliary verb (helps the main verb).
• c. "The soccer player will score goals." "Will" is used with the main verb "score" to indicate future tense. It's an auxiliary verb.
• d. "The animals are cute." "Are" links the subject "animals" to the predicate adjective "cute" (describes the subject), so it's a copular verb.
• e. "Mr Sherzad is my teacher." "Is" links the subject "Mr Sherzad" to the predicate noun "my teacher" (renames the subject), so it's a copular verb.
• f. "Those headphones were expensive." "Were" links the subject "headphones" to the predicate adjective "expensive" (describes the subject), so it's a copular verb.
• g. "My refrigerator is running." "Is" is used with the main verb "running" (participle) to form the present continuous tense. So "is" is an auxiliary verb.
• h. "The astronaut will fly the rocket." "Will" is used with the main verb "fly" to indicate future tense. It's an auxiliary verb.

Answer:

a. Copular
b. Auxiliary
c. Auxiliary
d. Copular
e. Copular
f. Copular
g. Auxiliary
h. Auxiliary