Those aren't watches. 再问： is this a dictionary复数形式 再答： Are these dictionaries? 再问： it's a photo复数形式 再答： They're photos. 再问： those aren't english books单数形式。 再答： That isn't an English book. 再问： Are these oranges单数形式 再答： Is this an orange? 再问： they are my sisters单数 再答： She is my sister.
