Keiko told her kid to put on his helmet, but he’d already swung his leg over the bike and was halfway down the street.
ケイコが子供にヘルメットをかぶるよう言ったときには、もう自転車にまたがって通りの半分まで行っていた

Ryohei installed a child seat, put one child in the front and one in the back, stuffed his purchases in the front basket, and somehow still managed to hold the handlebars.
亮平はチャイルドシートを取り付け、前と後ろに子供を二人乗せ、買った物を前カゴに詰め込んで、それでも何とかハンドルを握っていた

The sign said ‘clear the sidewalk of bicycles,’ but there were about forty bikes out there.
看板には『歩道から自転車を撤去してください』って書いてあったのに、40台くらいの自転車があったよ

My sisiter lowered the saddle for her daughter and made her wear a helmet.
妹は娘のためにサドルを下げて、ヘルメットをかぶらせたんだ

Meme rode off dashingly on his bike — still in his pajamas.
めめってばチャリンコで颯爽と走り去ったんだけど——パジャマのままだった