Learn Dutch: We wachten totdat het reuzenrad stopt. - We wait until the Ferris wheel stops.

Both mean until, but they are used differently. You use totdat to connect two full clauses (parts of a sentence that each have a subject and verb), like we wachten and het reuzenrad stopt. You use tot before a noun or a time phrase, like tot morgen (until tomorrow) or tot het einde (until the end).

Why does stopt come at the very end of the sentence?

The word totdat is a subordinating conjunction. This means it introduces a dependent clause and pushes the working verb (stopt) to the very end of that part of the sentence. Even if we added more words like het reuzenrad eindelijk stopt (the Ferris wheel finally stops), the verb would still go to the end.

How is the word reuzenrad formed?

It is a compound noun made of reuzen (giants) and rad (wheel). A giant's wheel is the Dutch way of saying Ferris wheel. Because rad is a het word, the whole compound takes the article het to become het reuzenrad.

Why don't we use op here, like in wachten op (to wait for)?