用作定语
▲~+n.
There were many vacant seats in the theater.剧院里有许多空座位。
Are there any vacant positions in your firm?你们公司有空缺吗?
He stared into space with a vacant expression.他茫然地凝视着天空。
用作表语
▲S+be+~
Is the lavatory vacant?厕所里没人吧?
The top post in the delegation was still vacant.代表团中的最高职位仍空着。
His mind seems completely vacant.他的头脑似乎空空如也。