~ものだ (general truth / expected behavior)

It's always the nights you can't sleep that the ticking of the clock gets on your nerves.

People who praise you to your face often say bad things behind your back.

He's really fallen if he'd lie to me.

We gave up, figuring he must be dead.

The more you study, the more you realize how little you know.

When you do something yourself, it naturally becomes dear to you.

You're destroying evidence — what the heck?! Normally you'd call the cops, right?!

It's basic manners to give your all to a game that someone made with their whole heart, you know? Hitting the pause button would be rude to the game!

On the flip side of sorrow, there is joy.

You're supposed to keep your promises.

There are troublemakers everywhere.

The night sky is truly beautiful.

Dreams don't always come true.

A barking dog seldom bites.

Every animal instinctively has the instinct for self-defense.

She is a noblewoman, and expects to be treated as one.

Hey Ren, want big sis to hold your hand for you? You always wander off every year, after all.

A thesis? What I write is just personal essays, essay-like stuff, you know.

A good daughter grows into a good wife.

Good management listens to reasonable demands.

You always want what catches your eye.

She admitted she had lost the brooch two or three months ago.