This has nothing to do with English language but it's a funny fact I like to share with you on this Sunday afternoon CET.
Dutch language has a few nasty traps, you can only avoid them intuitively (if that intuition is correct) because once you start to examine these problems it becomes a total nightmare. On the brighter side, these tempting mistakes won't have a big impact on the context of whatever it is you're writing or saying. If anything, only the people who know how to spell those words correctly - like maybe 20% of the Dutch population, optimistically - would notice the mistakes. You know, the snobs.
Compared to der/die/das multiple-choice puzzle in German language it's all relatively cool.
But anyway, for those who are not really "feeling" it they've invented some practical tricks, and one of those tricks is called the SMURF rule. "When in doubt about the "d" or "dt" spelling, replace the verb** with the word
smurf, and then you will hear the difference". I don't know of any other language that has a smurf rule, but I could be wrong.
It would be nice to actually use that smurf rule but I'm one of the snobs who knows how to spell those words correctly so...it's not for me. Hm.
**to make things extra funny, it's about the Dutch word "word/wordt" (=become)
When all is spat and done, the "TH" is just a "D" in denial.
End rant. Au revoir, voyage voyage.