Learn Croatian: Jutros nisi čuo budilicu. - You didn't hear the alarm clock this morning.

We use the negative helper verb nisi and the past action word čuo. In Croatian, instead of saying 'ne si', the negative word ne (not) merges with the helper verb si (you are) to create nisi.

How would this change if we were speaking to a woman?

You would say Jutros nisi čula budilicu. In the past tense, the main verb must match the gender of the person doing the action. The -o ending in čuo is for a male, while the -la ending in čula is for a female.

Where is the word for 'you' in this sentence?

Croatian usually drops pronouns like ti (you) because the helper verb nisi already clearly tells us who the subject is. You would only add ti to the sentence if you wanted to emphasize that you specifically didn't hear it.

Why does the word for alarm clock end in -u (budilicu)?

The dictionary form of the word is budilica. Because the alarm clock is the direct object (the thing that wasn't heard), it takes the accusative case. For feminine nouns, this means changing the -a ending to -u.