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Chinese grammar - Purpose or reason for an action with 为 (wèi)

Purpose or reason for an action with 为 (wèi)

In Chinese, the preposition (wèi) is used to indicate the purpose or reason for an action.

It connects the action with its intended purpose.

It is equivalent to 'for' in English where it in dicates purpose or reason.

Examples:
他为考试做准备。
tā wèi kǎoshì zuò zhǔnbèi.
He prepares for the exam.
她为家庭做饭。
tā wèi jiātíng zuòfàn.
She cooks for the family.

家庭 (jiātíng) means 'family'

我们为比赛训练。
wǒmen wèi bǐsài xùnliàn.
We train for the competition.

训练 (xùnliàn) means 'training' or 'to train'

我昨天为妈妈买了花。
wǒ zuótiān wèi māma mǎi le huā.
I bought flowers for my mom yesterday.
他为她写了一封信。
tā wèi tā xiě le yì fēng xìn.
He wrote a letter for her.
她为他的生日做了蛋糕。
tā wèi tā de shēngrì zuò le dàngāo.
She made a cake for his birthday.
他们为晚餐买了食材。
tāmen wèi wǎncān mǎi le shícái.
They bought ingredients for dinner.

食材 (shícái) means 'ingredients'

他将为孩子们组织活动。
tā jiāng wèi háizimen zǔzhī huódòng.
He will organize activities for the children.

组织 (zǔzhī) means 'organize'

活动 (huódòng) means 'activity'

他们将为客人准备礼物。
tāmen jiāng wèi kèrén zhǔnbèi lǐwù.
They will prepare gifts for the guests.
他正在为演讲做准备。
tā zhèngzài wèi yánjiǎng zuò zhǔnbèi.
He is currently preparing for the speech.

(yǎn) shifts to second tone (yán) before a third tone, as in 演讲 (yánjiǎng)

演讲 (yánjiǎng) means 'speech'

她正在为孩子们做饭。
tā zhèngzài wèi háizimen zuòfàn.
She is currently cooking for the children.
我为考试做准备,所以没有时间玩。
wǒ wèi kǎoshì zuò zhǔnbèi,#suóyǐ méiyǒu shíjiān wán.
I am preparing for the exam, so I don't have time to play.
她为他的生日做了蛋糕,并且买了礼物。
tā wèi tā de shēngrì zuò le dàngāo,#bìngqiě mǎi le lǐwù.
She made a cake for his birthday and also bought a gift.
他们为晚餐买了食材,然后开始做饭。
tāmen wèi wǎncān mǎi le shícái,#ránhòu kāishǐ zuòfàn.
They bought ingredients for dinner and then started cooking.
他为他的外套花了五百块钱。
tā wèi tā de wàitào huā le wǔbǎi kuàiqián.
He spent 500 yuan for his coat.