Cannot A; must not A
7
先生が執筆している最中は、声をかけてはならないよ。
You mustn't call out when the teacher is in the middle of writing.
7
やたらに人を羨んではならないよ。意味のないことだ。
You mustn't excessively envy others. It makes no sense.
4
彼の気持ちを思いやるなら、同情してはならないよ。
If you consider his feelings, you mustn't sympathize (with him).
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