Meaning & usage
ついでに shows that a secondary action is done by taking the opportunity of a main outing or task, often translated as also or while you are at it. It follows nouns with の, as in 買い物のついでに, and verbs in the dictionary form or た form, as in 寄るついでに or 寄ったついでに, and it can also stand alone as an adverb. The main occasion must be stated or clear from context, and the ついでに action is understood as incidental rather than the main purpose.
Example sentences 3
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ついでに私のも買ってきてくれますか。
Can you buy one for me as well?
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ガソリンを満タンにして、ついでにオイルも見てくれませんか?
Could you fill it up and take a look at the oil, too?
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知ってるよ。ついでに言えば、恵子とは「はとこ」だからね。
I know! And let me also say that Keiko is a SECOND cousin of mine.
In past JLPT papers
This came up in 5 past exam questions.
And 1 more test.