て当然だ・
Given what came before, the result is only what you would expect: "of course", "no wonder". It can be blame, and it can be comfort.
て-form
Practicing this much every day, of course you get better.
のも
After a meeting that long, no wonder everyone is tired.
How to form it
Verb in the て-form + 当然だ ／ Plain form + のも当然だ
Negative: 知らなくて当然だ. Before の, a な-adjective or a noun takes な: 人気なのも当然だ. Often either shape fits: 怒られて当然だ, 怒られるのも当然だ. In everyday talk people often say 当たり前だ instead, in the same two shapes.
- Before it
- The result. The reason usually comes first, with のだから, ば or なら, often with これだけ or あれだけ.
- Tone
- Firm: no other result was possible.
- Where you'll meet it
- Conversation and writing alike.
In use
After years of use, of course the parts wear out.
No wonder this town is popular with tourists: the scenery is beautiful and it is easy to get to.
The teacher told me off again.
You forgot your homework three times. Of course you got told off.
Blame, or comfort
After something a person did wrong, the bad result was earned: they had it coming. After なくて, to someone new at a thing, there is nothing to be ashamed of.
blame
If you don't keep your promises, of course people won't trust you.
comfort
It's your first time. Of course you can't do it yet.
当然だ or もっともだ?
当然だ looks at cause and result: after that, this had to follow. もっともだ looks at a person: what they feel or say is reasonable, and you take their side.
My little brother kept her waiting for two hours, so he deserved the telling-off.
The result he had coming. Blame is 当然だ.
She was kept waiting for two hours, so she has every right to be angry.
Her anger is reasonable. You are on her side.
彼女が怒るのも当然だ fits too. It is firmer: anger was bound to follow.
Close neighbours
のももっともだN2
"It's understandable", "I don't blame them": fair-minded, and a little formal.
He has worked for three months without a day off, so it's understandable that he wants to quit.
わけだN3
"So that's why": you have just heard the reason, and something you had noticed makes sense.
She has practiced the piano every day since childhood. No wonder she plays so well.
Check yourself
1What is B doing?
A
Choose an answer to see why.
2Which one fits?
十年も
Choose an answer to see why.
More detail
About what someone ought to manage, it sets a standard, and that can feel like pressure.
I've lived here for ten years, so people take it for granted that I speak Japanese.
More sentences
The weather suddenly got worse, so of course the flight is delayed.
It was her first time alone on stage, so no wonder she was nervous.
With facilities this good, no wonder it costs a lot to use.
If you keep ignoring the rules, you can only expect to be turned away.