Choose the most appropriate option to complete the following:________…

The correct answer is Option (2) → Not only did his father give him money

Inversion after "Not only":

• When a sentence begins with Not only, the helping verb comes before the subject, as in a question:
  • pattern: Not only + helping verb + subject + base form of the verb;
  • the helping verb takes the tense of the sentence.
• This sentence:
  • the second part, "but his mother did too", is in the past, so the helping verb is did;
  • after "did" the main verb is in the base form, give: "Not only did his father give him money, but his mother did too."
    Complete sentence: Not only did his father give him money, but his mother did too.
    Example: Not only did she win the race, but she also broke the record.

Why the Other Options are Incorrect?

Option 1: Not only does his father gave him money — Incorrect.

• After "does", the verb must be in the base form (give), not the past form "gave".
• The present "does" does not match the past "did" of the second part.

Option 3: Not only his father give him money — Incorrect.

• There is no helping verb, so the required inversion is missing.
• "His father give" also breaks subject-verb agreement.

Option 4: Not only does his father give him money — Incorrect. The inversion is correct, but the present tense "does" clashes with the past "did" in "but his mother did too".