通过分类将一组文本分为两个组，其中一个组包含所有提到时间的句子，另一个组不包含任何时间信息的句子。
"Yesterday, I went to the market to buy some fruits. My sister called me at 3pm to remind me to buy milk on my way back. I also met an old friend who I haven't seen in years."
包含时间信息的句子： "Yesterday, I went to the market to buy some fruits." 和 "My sister called me at 3pm to remind me to buy milk on my way back."

不包含时间信息的句子："I also met an old friend who I haven't seen in years."