Meaning & usage
だって attaches to nouns to mean too, also, or even, like ママだって or ギターだって, and adds emphasis that the noun is an unexpected or additional case. With question words such as 何だって, 誰だって, and いつだって it means any or every, as in whatever, whoever, and whenever. It is colloquial and common in speech, so でも or も is preferred in formal writing.
Example sentences 6
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1分だってほぼ4ポンドかかるんだから。
Because just one minute costs nearly four pounds.
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好きなことは何だってやっていいんだよ。
You can do whatever you like.
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彼は歌もうまいが、ギターだって同じくらい上手だ。
His singing is very good, but he plays the guitar just as well.
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ママだって知ってるよ。
Even my mom knows.
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私ができるんなら、あなただってできるわ。
If I can do it, so can you.
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彼はいつだってちゃんと勉強している。
He always studies hard.
In past JLPT papers
This came up in 6 past exam questions.
And 2 more tests.