なくてもいい， なくてもよい， なくても良い， 無くても良い
1. need not, (not) have to
2. need not have, need not exist
不必；没有必要；不必如此，不必存在
郵便局に何度も足を運ばなくてもいいように、切手を沢山手元においてある。
tbd
I keep a good supply of stamps to save trips to the post office.
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飛行機の予約を再確認するために必ずしも空港へ行かなくてもよい。
tbd
You don't necessarily have to go to the airport to reconfirm your plane reservation.
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疲れているならそんなに一生懸命勉強しなくてもよいです。
tbd
You don't have to work so hard if you're tired.
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彼女は土曜日学校に行かなくてもよい。
tbd
She doesn't have to go to school on Saturday.
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彼は翌日学校へ行かなくてもいいように、病気のふりをした。
tbd
He pretended to be ill so that he wouldn't have to go to school the next day.
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彼は車の代金を翌月まで払わなくてもよいように取り決めた。
tbd
He bargained that he should not have to pay for the car till the next month.
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彼は今日は学校へ行かなくてもいい。
tbd
He doesn't have to go to school today.
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彼は今日は学校に行かなくてもよい。
tbd
He doesn't have to go to school today.
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彼は学校へ行かなくてもよい。
tbd
He doesn't have to go to school.
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彼はこのことをしなくてもよい。
tbd
He does not have to do this.
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