General apologies:
* Excuse me
* Sorry
* I'm sorry
More formal apologies:
* I apologize
* My apologies
Expressing regret:
* I'm so sorry
* I regret
To get someone's attention:
* Excuse me
It's important to note that "sumimasen" is a very versatile word in Japanese, and its exact meaning can vary depending on the situation. The best way to choose the right English word is to consider the context and the speaker's intent.