Word
unfastened
/ʌnˈfæsənd/
verb
解开（尤指衣服或带子）；松开
to cause something to become undone; to become undone or untied
解开(尤指衣服或带子)( unfasten的过去式和过去分词 ); 松开; 解开；脱开；松开
In use
She unfastened her seatbelt as soon as the plane landed.
He unfastened the buttons on his shirt because it was too hot.
The child unfastened the straps of her backpack to take out a book.
be unfastened
表示状态，用be动词+过去分词作表语。
The belt was unfastened.
腰带被解开了。
unfasten sth
过去式形式为 unfastened。
She unfastened her necklace.
她解开了项链。
unfastened + noun
unfastened 作定语修饰名词。
He noticed the unfastened button.
他注意到了那颗未扣好的纽扣。
Verb forms
base unfasten · third person unfastens · -ing unfastening · past unfastened · past participle unfastened
Common mistakes
Please unfastened your coat.Please unfasten your coat.
错误使用了过去分词 unfastened 作为祈使句的动词原形，应该用动词原形 unfasten。
The window is unfastening.The window is unfastened.
描述窗户的状态（未关紧）应使用过去分词 unfastened 作形容词，而不是现在分词 unfastening，后者表示正在进行的动作。
Connections
Confusing words
- untied
- 解开的（尤指鞋带、绳结等） · untied 专指鞋带、绳结等系物被解开；unfastened 范围更广，可指衣服、带子、锁扣等任何固定物被松开。
- unbuttoned
- 解开纽扣的 · unbuttoned 仅指纽扣被解开；unfastened 可泛指任何闭合方式（如纽扣、拉链、钩环等）被松开。
- unlocked
- 未锁的，开着的 · unlocked 专指锁未被锁上；unfastened 通常不用于锁具，而是用于衣物、带子等可系紧之物。
Learner notes
Grammar Note
动词：解开（尤指衣服或带子），松开；形容词：未系紧的，未扣好的
Dictionary facts from ECDICT, WIKTIONARY.