THAT IS A CRAZY ENGLISH SENTENCE..NO ONE TALKS LIKE THAT IN ENGLISH
But it's a grammatically correct. Doulingo allows you to improve your English while studing a new language. That's nice isn't it? :)
I'm learning new English words as well !
A better sentance is: "Whose knife is this"
Can't it be למי הסכין ?
I was taught that it can.
it for who
למה לא טוב "של מי הסכין הזה"?
Because it's "the knife", not "this knife".
The word סכין can be both male or female (there are a bunch of such words in Hebrew), so זה and זאת are both correct. However, the English for that would be with "this knife".