she's going to dentist's .请问she后面的一撇s做何解?who got the most new years's card...she's going to dentist's .请问she后面的一撇s做何解?who got the most new years's cards?请问years后面的一撇s又是什么?我知道dentist'

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she's going to dentist's .请问she后面的一撇s做何解?who got the most new years's card...
she's going to dentist's .请问she后面的一撇s做何解?who got the most new years's cards?请问years后面的一撇s又是什么?
我知道dentist's指牙医诊所,我问she后面的一撇s做何解,为什要加。

第一个:She is going to dentist's.作is解,是现在进行时时态句型.第二个year's是所有格解,新年的……

dentist's指牙科医生诊疗所
years's与year's不同之处只是一个是好几年,一个是一年

前者,be动词;后者,名词所有格。 most new=>newest ??