sometimes是频度副词，表示“有时候”。sometime是副词，表示“曾经，某时，有朝一日”，常同过去时或将来时连用。some times里的time表示次数，注意跟some time做区别，some times表示几次、好几次。
sometimes的例句
1. He told some lies and sometimes just embroidered the truth.
他说了些谎，有时只是对事实添油加醋了一番。
2. You must have noticed how tired he sometimes looks.
你一定注意到他有时候显得特别疲惫。
3. "Well," he conceded, "I do sometimes mumble a bit."
“嗯，”他承认道，“我有时候说话的确有点吐字不清。”
4. Jane's always annoying her and she takes it out on me sometimes.
简老是惹她生气，她有时就拿我出气。
5. Sometimes things don't turn out the way we think they're going to.
有时事情并不像我们认为的那样发展。