Breakdown of tyuui wo sinai to, saihu wo ototosite simaimasu.
をwo
direct object particle
とto
conditional particle
〜て〜te
connective form
〜ない〜nai
negative form
財布saihu
wallet
注意するtyuuisuru
to pay attention
注意tyuui
attention
落すotosu
to drop
しまうsimau
to end up (regretfully)
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