Do languages have articles: a B1 guide
先写下记得的内容，再查看解释。不要填写个人信息。
查看解释
Articles help show how a noun relates to the conversation. A and an introduce one unidentified countable item; the points to something the listener can identify. General plural and uncountable nouns often take no article. Other determiners, names, and fixed expressions have their own patterns.
A courier delivered a letter this morning.