You can only use this method to check if the number can be divided by 3.

He was showing how gendered words can resolve ambiguity in an example were this also applies in english, so that you can extrapolate to situations like the one I (or the other replies) showed.

Zehzins example is also true for objects. “After the cat jumped on the table with the glass and the bowl it pushed it down.” Did the cat push down the glass or the bowl? In german for example it’s “Nachdem die Katze auf den Tisch mit dem Glas und der Schüssel gesprungen ist, hat sie sie heruntergestoßen.” (In this case the bowl) or “Nachdem die Katze auf den Tisch mit dem Glas und der Schüssel gesprungen ist, hat sie es heruntergestoßen.” (In this case the glass).