The modal adverb 当然
The modal adverb (语气副词) expresses subjective judgment or assurance toward an action.
当然 
expresses agreement or emphasizes confidence in what has been said.
当然 is usually placed before a predicate. The predicate can be expressed by a verb or an adjective.
expresses agreement or emphasizes confidence in what has been said.
当然 is usually placed before a predicate. The predicate can be expressed by a verb or an adjective.
Examples
我当然喜欢！
Of course I like it!
wǒ dāngrán xǐhuan
她当然很漂亮
Of course she's beautiful
tā dāngrán hěn piàoliang
当然 can also be used independently. In this case, it must be followed either by a period or comma.
Examples
当然，这只是我个人意见
Of course, this is just my personal opinion
dāngrán, zhè zhǐshì wǒ gèrén yìjiàn
不管怎样，你们还是朋友 —— 那当然
Anyway, you are still friends — Yes, of course
bùguǎn zěnyàng, nǐmen háishì péngyou — nà dāngrán
If 当然 is used independently, it can be followed by the modal particle 了 to emphasize conviction.
to emphasize conviction.Examples
当然了，你自己也知道这点
Of course you know it
dāngrán le, nǐ zìjǐ yě zhīdào zhè diǎn
是啊，当然了
Yes, of course
shì a, dāngrán le
当然 can also be used in a short negative answer:
Examples
我拒绝的话情况或许会好些？—— 当然不
Maybe it would be better if I turned it down? — Of course not
wǒ jùjué de huà qíngkuàng huòxǔ huì hǎoxiē — dāngrán bù