Modal adverbs 偏 and 偏偏
The modal adverb (语气副词) expresses subjective judgment or assurance toward an action.
The adverb 偏
We use 偏 
to emphasize that something is being done with the specific intention of causing negative feelings.
to emphasize that something is being done with the specific intention of causing negative feelings.Scheme
subject
偏
predicate
Examples
他明知道我不懂，可偏要提出许多问题来难我
He knows that I don't understand, but he keeps asking a lot of questions to put me at odds
tā míng zhīdao wǒ bù dǒng, kě piān yào tíchū xǔduō wèntí lái nàn wǒ
不该她去，她偏要去
She shouldn't have gone, but she went out of spite
bù gāi tā qù, tā piān yào qù
The adverb 偏偏
We use 偏偏 to emphasize that events are not turning out the way the speaker wants or expects, and that the speaker is not satisfied with this.
to emphasize that events are not turning out the way the speaker wants or expects, and that the speaker is not satisfied with this. Pay attention
We should state 偏偏 before or after the subject.
Examples
他们已经穿好衣服准备要走了，可孩子偏偏又醒了
They were already dressed and ready to go. But as luck would have it, the child woke up again
tāmen yǐjīng chuānhǎo yīfu zhǔnbèi yào zǒu le, kě háizi piānpiān yòu xǐng le
我没带雨伞，偏偏下起了大雨
I didn't bring an umbrella, and it started raining heavily
wǒ méi dài yǔsǎn, piānpiān xiàqǐ le dà yǔ
Sometimes 偏偏 can also mean “only”. In this case we should state the adverb 只 after it.
after it.Examples
喜欢她的男孩子很多，可她偏偏只喜欢他
There are many boys who like her, but she only likes him
xǐhuan tā de nán háizi hěn duō, kě tā piānpiān zhǐ xǐhuan tā
同事们都在工作，偏偏他一个人在玩儿游戏
All his colleagues are working, but he is playing games alone
tóngshìmen dōu zài gōngzuò, piānpiān tā yí ge rén zài wánr yóuxì