My father was good-looking when he was a college student.

Question

BlackTom AI · Accepted Answer

Question restatement: The prompt asks about the phrase describing 'My father was good-looking when he was a college student.' with four multiple-choice options in Japanese.
Option 1: ちちは、だいがくせいの時、かっこいいでした。
- This uses かっこいい (present/friendly form of 'cool/works with current state') plus でした, which is grammatically odd because かっこいい is an i-adjective in its base form; the polite past form would not pair かっこいい with でした. The construction is incorrect for expressing a past state.
Option 2: ちちは、だいがくせいの時、かっこいかったです。
- Here the stem is かっこい (the misrooted form of かっこいい) and then かったです, yielding an ungrammatical hybrid. Japanese would not use かっこい + かった; the correct past polite conjugation of かっこいい is かっこよかったです, so this option misconjugates the adjective.
Option 3: ちちは、だいがくせいの時、かっこよいかったです。
- This attempts a past form with かっこよい, which is an archaic or less common variant of かっこいい, but in standard modern Japanese the common and expected form for this meaning is かっこよかったです. Using かっこよいだ? or かっこよいかった is not standard; the combination is incorrect.
Option 4: ちちは、だいがくせいの時、かっこよかったです。
- This is the correct expression: かっこよかったです is the proper past polite form of the i-adjective かっこいい, matching the meaning 'was good-looking' in the past tense and appropriate politeness level for a statement about the father in a formal or respectful context.

Additional notes: The sentence pattern follows [subject は/が] [time phrase]、[adjective in past polite form] です/でした. Among the options, only the fourth adheres to standard conjugation rules and natural usage for describing a past trait in polite speech, while the others misuse adjective conjugation or form. The first option incorrectly combines the present-form adjective with a past polite ending, the second option corrupts the stem, and the third uses an uncommon/archaic variant that is not standard in contemporary Japanese. Noticing these conjugation details helps distinguish the correct choice from the distractors. Ensure you keep the formal politeness level and the correct past tense when talking about a past characteristic.

My father was good-looking when he was a college student.

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