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Yotsuba sees Fuuka on her bike up above and calls out (to her?)…
はしをわたらないと
はしを - 橋を - the bridge (and を particle)
わたらない - 渡らない - the negative of 渡る, to cross over; to go across
と - this is where I have problems
I guess she is saying “don’t cross the bridge!” (ie, wait for me) but I don’t understand that と. It looks like the conditional と of “if” or “when”, but I can’t see how that fits. Any ideas? And thank you!