Prepositions: useful is used in useful for , useful for and useful to . The words useful to are also found in constructions such as It is useful to do, in which to marks an infinitive rather than being a preposition.
発音 副詞 usefully (comparative more usefully, superlative most usefully) In a useful manner; in a way that achieves something I would rather have it said, " He lived usefully," than, " He died rich."
名詞 utility (countable and uncountable, plural utilities) The state or condition of being useful; usefulness.
