My school taught this whole convoluted system that was meant to help students with multiple tenses, but I just learned to apply the “ik loop” mnemonic which is so effortless (to native speakers at least.)
Sometimes I have to think once or twice about soft ketchup/'t Kofschip for the past participle, but that’s about it.
In Dutch, the only (one) is “de enige”. People often use “de enigste”, which actually means the cutest. Enig -> enigste.
“Ik ben als enigste over” “Ja, schattig ben je zeker”
"“Ich bin der Einzigste, der noch übrig ist” “Ja, du bist wirklich süß”
“I’m the only one left.” “Yeah, cute you sure are”