we are studying English , can upload file .
studying English
good morning，some guys
the +形容词：泛指…的人，代表复数。
a/an 的用法 a+字音(A E I O U)开头的单数名词./an+母音开头的单数名词。a book ;a girl;a young man ,an apple;an umbrella;an old woman。
字尾非s的复数名字所有格表达式：名词's（例）children's playground:孩子们的游乐园。
桌子的脚:the legs of the table;女孩的名字:the girl's name/the name of the girl.
(无)生物所有格:A的B-B of A
Harry and Bill's father is a scientist：海伦和比尔的父亲是科学家；Harry's and Bill's fathers are scientists.：海伦的父亲和比尔的父亲是科学家。
共同所有格表达式—名词+名词's;个别所有格—名词's+名词's.
a girls' shool:女校;these students' techer:这些学生的老师，复数单词不是s结尾的要加's。
单数所有格家+'s：复数名词所有格s'
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good morning，some guys