Learn Dutch: Is dit horloge duur? - Is this watch expensive?

We use dit because horloge is a het word (het horloge). When you want to say 'this' with a het word, you use dit. For de words, you would use deze.

How does the word order make this a question?

Just like in English, you make a simple yes/no question by swapping the verb (is) and the subject (dit horloge). A regular sentence would be Dit horloge is duur (This watch is expensive).

The word horloge looks French. Does it sound French too?

Yes, it is a loanword from French! Unlike typical Dutch words, the 'g' in horloge is pronounced like the 's' in the English word measure or vision.

Why doesn't the adjective duur get an extra 'e' at the end?

In this sentence, duur comes after the verb (is) rather than directly in front of a noun. When an adjective is used this way, it stays in its basic form and never gets an extra 'e'.