~てはいけない (must not)

Is it really not okay to just let a baby cry?

In the font business, you must never trust anyone.

You shouldn't rank jobs as high or low, you know~.

You must not be captivated by short-term gains alone.

You've got an English test tomorrow, right? Then you shouldn't be wasting time on math homework tonight.

You shouldn't go to sleep with the lights left on.

Don't tease him just because he can't write his name.

Don't resort to violence.

She gave me a signal not to say anything.

You must not be discourteous to your benefactor.

You shouldn't naively believe a manufacturer's sales pitch.

Don't get off before the train has stopped.

You shouldn't rely on other people too much.

You're not allowed to go out after dinner.

Don't give in to temptation.

We can't leave the problem like this.

Don't read books in dark places — it's bad for your eyes.

Don't trust people who praise you to your face.

You really shouldn't overdo it, you know.

Don't stay up late just because you're not sleepy.

You shouldn't stay up late every night.

You mustn't re-lend a book.

You shouldn't eat while reading a book.

You mustn't judge a book by its cover.

My mother says you shouldn't exercise too much right after lunch.

My mother insists that I must not go out after dark.

You must not ride bicycles on the sidewalk.

Don't read while walking.

Don't speak to him while he's studying.

You shouldn't believe everything you hear.