A：Tom's dating your sister.
汤姆在和你妹妹约会。
B：Are you sure?
你确定吗?
注释：
date (约会)有下列两种用法：
a.作及物动词用，其后接人作宾语。
例：He said he wanted to date me.
= He said he wanted to ask me out.
(他说他想和我约会。)
b.作名词用，与介词on并用。
例：I'll be on a date with Betty tonight.
(我今晚和贝蒂有约。)