Let's try something.
Aliquid conemur.

I have to go to sleep.
Dormiendum est mihi.

Muiriel is 20 now.
Muiriel nunc XX annos nata est.

The password is "Muiriel".
Signum est "Muiriel".

I will be back soon.
Mox redibo.

I'm at a loss for words.
Verba mihi desunt.

This is never going to end.
Hoc numquam finiet.

I just don't know what to say.
Nescio quid dicere.

That was an evil bunny.
Cuniculus malitiosus erat.

I was in the mountains.
In montibus eram.

Is it a recent picture?
Estne pictura recens?

That won't happen.
Id non fiet.

I miss you.
Te desidero.

You should sleep.
Tu debes dormire.

You should sleep.
Oportet te dormire.

I'm going to go.

I can't live that kind of life.
Talem vitam agere non possum.

Most people think I'm crazy.
Plurimi homines credunt me esse delirum.

No I'm not; you are!
Non ego, sed tu!

That's MY line!
Id est meum dictum!

Are you sure?
Certumne'st tibi?

Oh, there's a butterfly!
Ecce papilio!

Hurry up.

Hurry up.

I'm so fat.
Tam pinguis sum.

So what?
Quid refert?

So what?
Quid ergo?

This is what I would have said.
Hoc dicam.

That's because you're a girl.
Id est quod tu puella es.

How many close friends do you have?
Quot amici cari tibi sunt?

That is somewhat explained at the end.
In fine paululo explicatur.

Why do you ask?
Cur rogas?

I can't tell her now. It's not that simple anymore.
Nunc ei hoc non possum dicere. Iam non enim est tam facile dictu.

How long did you stay?
Quamdiu mansisti?

I do not have an account in these forums.
His in foris nondum subsignavi.

I didn't know where it came from.
Non scivi unde veniret.

I didn't like it.
Mihi non placuit.

You're just running away from life's problems.
Modo a vitalibus problematibus effugis.

There's a problem there that you don't see.
Hic problema est quod nondum conspexi.

You can do it.
Facere potes.

I wish I could go to Japan.
Cupio ut Iaponiam visitare possim.

I won't ask you anything else today.
Nihil plus a te hodie petam.

That wasn't my intention.
Propositum meum non erat.

Thanks for your explanation.
Gratias de explanatione tua.

I don't know what you mean.
Nescio quid dicas.

There are many words that I don't understand.
Sunt multa verba quae non intellego.

You're really not stupid.
Vere, non es stulta.

No one will know.
Nemo sciet.

It seems interesting to me.
Notabile mihi videtur.

I like candlelight.
Lumen candelae mihi placet.