Question

Fill in the blank with the correct auxiliary verb from the choices given.
________ you brush your teeth every morning?

• A. Are
• B. Have
• C. Do
• D. Was

Answer 1

Answer: (C)

Do

The question mark at the end of the sentence indicates that it is an interrogative sentence. The verb 'brush' and the words, 'every morning' indicate that the sentence is in simple present tense.

The auxiliary, 'do' is used in an interrogative sentence along with simple present tenses of verbs. The appropriate form of 'do' which can be used with the subject, 'you' is 'do'. Hence, option C is correct.

Option A: 'Are' can be used in an interrogative sentence when the verb is in present continuous tense. Eg: 'Are you brushing your teeth every morning'. However, it cannot be used when the verb is in simple present tense. Hence, this option is incorrect.

Option B: 'Have' can be used in an interrogative when the verbin the simple past tense. Eg: 'Have you brushed your teeth today?". However, it cannot be used when the verb is in simple present tense. Hence, this option is incorrect.

Option D: 'Was' is the past form of 'be' and cannot be used when the verb is in simple present tense. Hence, this option is incorrect.