> 彼は瞳をキラキラ **させ** ながら言った。

I think that it is "He said with shining eyes", but what's a word "させ"? Why
"させ+ながら", and not "しながら"?
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2019-02-07T16:11:12.600
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2020-01-25T13:52:51.213
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question
grammar translation words usage verbs
「彼は瞳をキラキラさせながら言った。」 Why させながら, and not しながら?
させる is the causative form of verb する. In this sentence, it implies that 彼 made
some kind of effort (conscious or not) to make his eyes shine (possibly to
emphasize what he had to say).
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2019-02-07T17:39:31.697
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2019-02-07T17:39:31.697
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answer
キラキラする is intransitive "shine". eg 「瞳がキラキラする」"his eyes shine"

You use causative キラキラ **させる** "make something shine" here. eg
「瞳をキラキラさせる」"make his eyes shine"

> 彼は瞳をキラキラさせながら言った。

You can split this into two actions:  
「彼は瞳をキラキラさせた。」"He made his eyes shine" +「彼は言った。」"He said."

So the sentence literally means: "He said, while making his eyes shine." Hence
the translation "He said with shining eyes".

* * *

When combining two actions with ながら, you should use the same subject for both
verbs. i.e. you can't use two different subjects for the two actions, eg
「彼は、瞳がキラキラしながら言った。」 is incorrect.
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2019-02-07T17:51:15.053
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2020-01-25T13:51:20.607
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answer