How can I express sentences like "How long is ..." or "How old is ... " or "How convenient is ..." etc.?


I want to know if there's a grammar structure that can be used when you want
to know the **extent** of an adjective. E.g.

> 会長は若いね ＞＞ How young is he?
>
> この映画はとっても長いよ！ ＞＞ How long is it?
>
> たきくんは遅れてしまいました。 ＞＞ How late was he?

I know that there are other ways you can ask these questions
(会長は何歳ですか？・映画はどのくらいかかりますか？・たきくんは何時に来ましたか？) but I want to know if there's a
structure like "How [adjective] is [noun]?" in English that can be used for
any adjective.




You can say "どのくらい?" (casual) or "どのくらいですか?" (polite). You do not even need to
repeat the adjective.

> 「この映画はとっても長いよ！」「どのくらい？」
>
> 「たきくんは遅れてしまいました。」「どのくらいですか？」

(If 会長は若いね was said referring to the appearance of 会長 ("He _looks_ young,
doesn't he?"), asking how young he _looks_ is strange. If the first speaker
seems to know the exact age and said 「会長はとても若いんですよ」, it's fine to say
「どのくらいですか？」)

