it is indecorous to do sth
it作形式主语，不定式是真正主语
It is indecorous to laugh at a funeral.
在葬礼上笑是不得体的。
不得体的，不合礼节的
不当的,不雅的,猥亵的；不得体的；不合礼节的
lacking propriety and good taste in manners and conduct
不当的,不雅的,猥亵的
Improper, immodest, or indecent.
At a formal dinner, talking with your mouth full is considered indecorous.
在正式晚宴上，嘴里含着食物说话被认为是不合礼节的。
用法提示：indecorous 用作形容词，描述行为不符合社交礼仪。
His indecorous comments during the meeting offended several colleagues.
他在会议上的不当言论冒犯了几位同事。
用法提示：indecorous 修饰 comments，指言语不得体。
Wearing jeans to a wedding would be indecorous in many cultures.
在很多文化中，穿牛仔裤参加婚礼是不合礼节的。
用法提示：indecorous 描述穿着与场合不匹配。
it作形式主语，不定式是真正主语
It is indecorous to laugh at a funeral.
在葬礼上笑是不得体的。
形容词作定语修饰名词
He apologized for his indecorous behavior at the party.
他为在派对上的不得体行为道歉。
find + 宾语 + 宾补
She found his loud remarks indecorous.
她觉得他大声的言论不合礼节。
grammar · medium
易错句子His indecorous was obvious.
正确表达His indecorous behavior was obvious.
indecorous是形容词，不能直接作名词使用，必须后接名词如behavior。
grammar · medium
易错句子She found his joke indecorous because it was vulgar.
正确表达She found his joke indecent because it was vulgar.
indecorous指不合礼节或不得体，而indecent指下流或猥亵；vulgar暗示道德层面，应用indecent。
improper 强调不符合规范或标准，而 indecorous 强调不符合社交礼节。
indecent 强调违反道德或体面，常涉及性暗示，而 indecorous 仅指举止失礼。
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