Should I use kanji or kana for the first and second verbs in いってきます? When each verb is used individually there's usually kanji if I recall correctly, but I'm wondering if it's changed for being used in a stock phrase, and if so whether the first, second or both verbs use kana.
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I would write it as 行ってきます, with きます in Hiragana, probably because the きます([来]{く}る) is a subsidiary verb (補助動詞) here.
