she is an American.还是she is American

问题描述:

she is an American.还是she is American

应该是She is an American. 也可以这样She is from America。

She is an American.
American在表国籍时是不可数名词。

都行,因为American这样的词不仅表示“某一国的”,还表示“某国人”
比如She is an American.意思是她是一个美国人.如果没有冠词,意思就变为她是美国的.
American的首字母要大写.