button up sth / button sth up
up 为副词，宾语是名词时可放 up 前或后；若是代词，必须放在 up 前，如 button it up。
He buttoned up his jacket before stepping outside.
他出门前扣上了夹克。
用纽扣扣上；用纽扣扣住；被纽扣扣住；扣住；钉钮扣于
to fasten something with a button
用纽扣扣住
To fasten with a button.
被纽扣扣住
To be fastened by a button or buttons.
一般现在时
She buttons her coat before going out.
她出门前扣好外套的纽扣。
一般过去时
He buttoned his shirt carefully.
他仔细地扣好了衬衫的纽扣。
现在完成时
Have you buttoned your jacket?
你扣好夹克的纽扣了吗？
规则动词，-ing 形式为 buttoning，不双写 n。
She buttoned her jacket before going outside.
她出门前扣好了夹克的纽扣。
用法提示：“buttoned”是动词“button”的过去式，意为“用纽扣扣上”。
This shirt buttons at the front, so it is easy to put on.
这件衬衫在前面系扣，所以容易穿上。
用法提示：“buttons”是动词的第三人称单数形式，表示“用纽扣扣住”。
Please button your coat; it is cold outside.
请扣好你的外套，外面很冷。
用法提示：“button”是及物动词原形，用于祈使句，表示“扣上某物的纽扣”。
up 为副词，宾语是名词时可放 up 前或后；若是代词，必须放在 up 前，如 button it up。
He buttoned up his jacket before stepping outside.
他出门前扣上了夹克。
及物用法，宾语可以是衣物，也可以是具体的纽扣。
She buttoned the top button of her shirt.
她扣上了衬衫最上面的那颗纽扣。
衣物作主语，用主动形式表示它本身是怎么扣合的，常与 at the back、at the front 等连用。
This dress buttons at the back.
这条连衣裙在后面扣扣子。
grammar · medium
易错句子Please button on your coat before we leave.
正确表达Please button up your coat before we leave.
button 表示“扣上纽扣”时是及物动词，后面直接接宾语，不加介词 on；汉语“把扣子扣上”里的“上”容易诱导学习者误加 on。若要强调“扣好、扣紧”，用固定短语 button up + 宾语，也可以说 button your coat。
grammar · medium
易错句子Hurry up and button up it.
正确表达Hurry up and button it up.
button up 属于“动词 + 副词”型短语动词，宾语是代词（it、them）时必须夹在动词和副词之间，即 button it up；只有名词宾语才能放在 up 之后，如 button your shirt up 或 button up your shirt。
grammar · medium
易错句子It's so hot in here that I buttoned my jacket.
正确表达It's so hot in here that I unbuttoned my jacket.
button 只表示“扣上纽扣”，不能表示“解开”。要表达“解开纽扣”须用 unbutton，其中前缀 un- 表示相反动作；汉语的“扣”和“解”对应两个不同的英语词，不能用 button 兼指两种动作。
扣好，扣上（全部纽扣）
Button up your jacket; it's cold outside.
把夹克扣好，外面很冷。
扣上外套
He buttoned his coat against the wind.
他扣上外套挡风。
扣上衬衫的纽扣
She buttoned her shirt before the interview.
面试前她扣上了衬衫的纽扣。
扣上最上面那颗扣子
Button the top button if you want to look formal.
想显得正式就扣上最上面那颗扣子。
一直扣到领口
He buttoned his shirt up to the neck.
他把衬衫一直扣到领口。
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