当然 dāngrán
当然（dāngrán）means “of course; naturally”. "当然" means something is a matter of course — expected, reasonable, or beyond doubt. Formation: 当然 + 谓语 / 当然（！）作独立回答
of course; naturally
HSK3Formation
当然 + 谓语 / 当然（！）作独立回答
Explanation
"当然" means something is a matter of course — expected, reasonable, or beyond doubt. It can modify a predicate or stand alone as an emphatic "of course!" in answers.
Examples
你努力学习，当然会进步。
nǐ nǔlì xuéxí, dāngrán huì jìnbù
If you study hard, you'll naturally make progress.
这么难的题，他当然不会做。
zhème nán de tí, tā dāngrán bú huì zuò
Such a hard problem — of course he can't do it.
Note
As a standalone reply, "当然可以 / 当然" sounds warm and confident.
FAQ
当然 — what does it mean and how is it used?
of course; naturally. "当然" means something is a matter of course — expected, reasonable, or beyond doubt. It can modify a predicate or stand alone as an emphatic "of course!" in answers.
当然 — how do you form it?
当然 + 谓语 / 当然（！）作独立回答
当然 — any usage notes?
As a standalone reply, "当然可以 / 当然" sounds warm and confident.