日本郵便トップ > よくあるご質問・お問い合わせ > よくあるご質問・お電話でのお問い合わせ よくあるご質問・お電話でのお問い合わせ The explanations are centered on how to sound right of your grammar not from English but from a Japanese point of view. ただ…しさえすればよい only have ［need］ to do； have to have only do； all a person has got to do is （to） do； have https://javfuq.com