For example, in Dutch we have different genders for nouns. In English it's only 'the' or 'a/an', while in Dutch it's 'de/het' (the) or 'een' (a/an). When the gender of the noun is female or male, it gets 'de', and when it's neutral it gets 'een' as a determiner.
I see your "de/het" and raise you our der/die/das But as a learner of both Dutch and French (le/la) I know I tend to just go on instinct and hope for the best.
English is actually a fairly easy language to learn (all things considered), so I'm glad it's the one that made it as lingua franca as the world. We'll all be screwed when the Chinese start ruling the world.