Learn Croatian: Čekamo te u pošti. - We are waiting for you in the post office.

Pošta is a feminine noun ending in -a. Because it comes after the preposition u (in) to show a location, we use the locative case. For most feminine nouns, the -a changes to -i in the locative case, making it pošti.

Why is the word for "we" missing from the Croatian sentence?

In Croatian, the pronoun mi (we) is usually dropped because the verb ending already tells you who is doing the action. The -mo at the end of čekamo means "we wait" or "we are waiting."

The English translation says "waiting for you", but there is no word for "for" in the Croatian sentence. Why?

The verb čekati (to wait) takes a direct object in Croatian. You don't "wait for" someone; you just "wait" them. That is why te (the short word for "you") is used directly in the accusative case without any preposition.

Could I put te at the beginning of the sentence?

No, te is a clitic (a short, unstressed word). Clitics have strict rules and generally must go in the second position of a sentence or clause. Here, it correctly follows the first word, Čekamo.