banknote

I change them.

私は替えます

I change the banknotes.

私は紙幣を替えます

I change the banknotes at the bank counter.

私は銀行の窓口で紙幣を替えます

I change the banknotes at the bank counter during my lunch break.

私は昼休みに銀行の窓口で紙幣を替えます

I change the banknotes at the bank counter with my coworker during my lunch break.

私は同僚と昼休みに銀行の窓口で紙幣を替えます