Title: Avoiding Repetition with Standalone Auxiliaries

Hint

Questions:

• Question: Lisa wants to study abroad, but her brother ___.
  Options:

  • doesn't
  • isn't
  • don't
  Explanation: Use **do-support** (*doesn't*) for third-person singular present simple main verbs.
• Question: "Have you finished your homework yet?" — "Yes, I ___."
  Options:

  • have
  • 've
  • did
  Explanation:

  Positive standalone auxiliaries at the end of a sentence **cannot be contracted** (*have*, never *'ve*).

• Question: We enjoyed the concert last night, and Peter ___ too.
  Options:

  • did
  • enjoyed
  • was
  Explanation: Use the past auxiliary **did** to replace the past simple verb *enjoyed*.
• Question: Tom can't play the guitar, but his sister ___.
  Options:

  • can
  • can play
  • is
  Explanation: Repeat the modal verb **can** and drop the repeated verb phrase *play the guitar*.
• Question: "Are your classmates ready for the presentation?" — "Yes, they ___."
  Options:

  • are
  • they're
  • do
  Explanation:

  Use the full form **are**. Positive standalone auxiliaries cannot be contracted at the end of an utterance.

• Question: I haven't visited Chiang Mai yet, but my parents ___.
  Options:

  • have
  • visited
  • did
  Explanation: Match the present perfect aspect using the plural auxiliary **have**.
• Question: Sam works at a hospital, but I ___.
  Options:

  • don't
  • am not
  • doesn't
  Explanation: Use **don't** for the first-person subject *I* with a present simple main verb.
• Question: "Who locked the front gate this afternoon?" — "Ken ___."
  Options:

  • did
  • locked
  • has
  Explanation: Use **did** to substitute for the completed past simple action *locked*.
• Question: You should submit your project today, and Sarah ___ too.
  Options:

  • should
  • should submit
  • does
  Explanation: Retain the modal **should** and omit the repeated verb phrase.
• Question: We were surprised by the news, but Anna ___.
  Options:

  • wasn't
  • didn't
  • weren't
  Explanation: Match the past copula *be* with the singular subject *Anna* using **wasn't**.
• Instruction: Fill in the blank with the correct standalone auxiliary:
  Question: My brother gets up early every morning, but I ___.
  Answer:

  • don't
  Explanation: Use **don't** to contrast with the present simple verb *gets up* for the subject *I*.
• Instruction: Fill in the blank with the correct standalone auxiliary:
  Question: "Who ate the last mango?" — "Dan ___."
  Answer:

  • did
  Explanation: Use the past auxiliary **did** to replace the past simple verb *ate*.
• Instruction: Fill in the blank with the correct standalone auxiliary:
  Question: Jane hasn't submitted her assignment, but they ___.
  Answer:

  • have
  Explanation: Use the plural present perfect auxiliary **have** to match the subject *they*.
• Instruction: Fill in the blank with the correct standalone auxiliary:
  Question: "Can you help me fix this lock?" — "Yes, I ___."
  Answer:

  • can
  Explanation: Echo the modal verb **can** without repeating the verb phrase.
• Instruction: Fill in the blank with the correct standalone auxiliary:
  Question: Paul forgot his rain jacket, but Maria ___.
  Answer:

  • didn't
  Explanation: Use **didn't** for negative contrast with a past simple main verb.
• Instruction: Fill in the blank with the correct standalone auxiliary:
  Question: We were nervous before the test, but Ken ___.
  Answer:

  • wasn't
  Explanation: Use **wasn't** to match the singular subject *Ken* in the past tense of *be*.
• Instruction: Fill in the blank with the correct standalone auxiliary:
  Question: "Are you coming to the party tonight?" — "Yes, I ___."
  Answer:

  • am
  Explanation: Never contract positive standalone auxiliaries at the end of a clause (**am**, not *'m*).
• Instruction: Fill in the blank with the correct standalone auxiliary:
  Question: Pim hasn't visited Japan, but I ___.
  Answer:

  • have
  Explanation: Preserve the present perfect aspect with the affirmative auxiliary **have**.
• Instruction: Fill in the blank with the correct standalone auxiliary:
  Question: "Will you join us for dinner?" — "Mark ___."
  Answer:

  • will
  Explanation: Echo the future modal **will** to omit the repeated predicate.
• Instruction: Fill in the blank with the correct standalone auxiliary:
  Question: Lisa wanted to join the road trip, but her friends ___.
  Answer:

  • didn't
  Explanation: Use **didn't** for negative past simple do-support.
• Sentence: I haven't visited Chiang Mai, but she has.
  Explanation: Omit the repeated verb phrase after the auxiliary **has**.
• Sentence: They are ready, and we are too.
  Explanation: Use **are** to echo the copula *be* without repeating the adjective.
• Sentence: He has left the office, but she hasn't.
  Explanation: Use the negative auxiliary **hasn't** to contrast present perfect actions.
• Sentence: Somsak likes spicy food, but his sister doesn't.
  Explanation: Use **doesn't** for third-person singular do-support in the present simple.
• Sentence: We arrived late yesterday, and they did too.
  Explanation: Use **did** to replace the past simple lexical verb *arrived*.
• Sentence: I don't eat seafood, but my brother does.
  Explanation: Use **does** to contrast habits in the present simple.
• Sentence: She couldn't find her keys, but he could.
  Explanation: Contrast modal ability in the past using **could**.
• Sentence: You should enter the contest, and your brother should too.
  Explanation: Repeat the modal **should** to omit the repeated verb phrase.
• Sentence: Pim didn't pass the driving test, but Maria did.
  Explanation: Use **did** to create an affirmative past contrast.
• Sentence: They haven't seen the movie yet, but we have.
  Explanation: Retain the uncontracted auxiliary **have** at the end of the clause.