可作限定詞 (det),意思為:二者,兩者都, 用英語解釋為:each of two; one and the other
Both books are thick. 兩本書都很厚。
可作為連詞 (conj.) ,意思為:不僅…而且…,…和…都, 壹般的形式為both..and...
用英語解釋為: the structure both...and is used to give two facts or alternatives and emphasizing that each of them is true or possible
Both you and I are students. 妳和我都是學生。