Don't be upset. I didn't mean that. 不要生气了，我不是故意的。

　　I didn't mean to offend (insult, upset) you. 我没有想冒犯（侮辱，刺激）你。

　　I didn't mean to do that. Let me clean it up. 我不是故意要那么做的。让我收拾吧。

　　I didn't mean to say that. 我不是故意要那么说的。

　　You should have been here an hour ago.  你应该一个小时之前就到了。

　　I didn't mean to be late.  我不是故意要迟到的。