Learn Croatian: Vidimo mirno selo. - We see a peaceful village.

The verb vidimo (we see) requires its object to be in the accusative case. However, for neuter nouns like selo (village) and the adjectives that describe them like mirno (peaceful), the accusative form is always identical to the nominative (dictionary) form.

Would the ending of mirno change if we were looking at an inanimate masculine noun instead?

Yes, it would change to the masculine form. Because inanimate masculine nouns in the accusative also look just like their dictionary forms, the adjective does too. For example, if we saw a city (grad), it would be vidimo miran grad.

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

In Croatian, you usually drop subject pronouns like mi (we) because the verb ending already tells you who is doing the action. The -mo ending on vidimo means 'we see', so adding mi is unnecessary unless you want to add special emphasis.

Is there a specific word for 'a' in Croatian, like in 'a peaceful village'?

No, Croatian does not have articles like 'a', 'an', or 'the'. The phrase mirno selo translates to 'a peaceful village' or 'the peaceful village' depending entirely on the context of the conversation.