Learn Swedish: Förlåt! Jag kan inte komma.

Both mean 'sorry' or 'excuse me', but förlåt is used to apologize for a mistake or when you genuinely feel bad about something, like canceling plans here. Ursäkta is more often used to get someone's attention or politely pass someone in a crowd.

Why is the verb komma used instead of the present tense kommer?

Because it follows the verb kan (can). Just like in English, when you use a 'helper' verb like kan, the main verb that follows it must be in its basic dictionary form (the infinitive). So it is kan komma (can come), not kan kommer.

Why does inte go between kan and komma?

In basic Swedish sentences, the word for 'not' (inte) always comes directly after the first verb. Since the first verb here is kan, inte naturally steps right between kan and the second verb komma.

Can I shorten kan inte the way we shorten 'cannot' to 'can't' in English?

Yes, in spoken Swedish and very informal text messages, people often blend them together into kan'te. However, in normal written Swedish, you should always write them out as two separate words: kan inte.