我把他当成我的好朋友。
wǒ bǎ tā dàngchéng wǒ de hǎo péngyou 。
I regard him as a good friend.
别把我当成小孩子。
bié bǎ wǒ dàngchéng xiǎoháizi 。
Don't treat me like a child.
他把盐当成糖放进了咖啡里。
tā bǎ yán dàngchéng táng fàng jìn le kāfēi lǐ 。
He mistook salt for sugar and put it in his coffee.