Meaning & usage
だけで shows that one action or thing alone is sufficient or is the only means used, often to say nothing more is needed. It follows a noun, as in フランス語だけで, or a verb in plain dictionary or ta form, as in サインするだけで or 待つだけで. It is neutral in speech and writing, but learners should keep the で because だけ alone only marks amount and does not convey means.
Example sentences 4
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来て下さるだけでいいのです。
I just want you to come.
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この紙にサインするだけでいいんだよ。
All you have to do is sign this paper.
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暗くなるまで待つだけでいいんだよ。
All you have to do is wait until dark.
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フランス語だけで話そうよ。
Let's only speak French.
In past JLPT papers
This came up in 6 past exam questions.
And 2 more tests.