later是后来，例如Later,the weather is becoming better than before.
after是在什么什么之后，例如A person is walking after me.或after school.
ago是在什么什么以前例如A long time ago. It is almost five years since I began to learn English.
亲╭(╯3╰)╮，满意请采纳！！！
追问那那个放在时间词的前面，哪个放在后面
追答ag0和later都行