Hi Phanasy; The relative pronoun in a clause must fit in the correct grammatical position in its clause. It can be subject, direct object, indirect object, or object of a preposition. I liked the cake which was decorated with pink icing .
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PhantasyAccording to your third example, you said "which" is the object of the preposition "of", I wonder whether I got it right or wrong, so this "which" refers to "the top of the cake", that is the "which" is giving further description about the "top" of the cake, is it right?Which refers to cake. So you can just substitute "cake" for "which"
AlpheccaStarsIt can be subject, direct object, indirect object, or object of a preposition.Don't forget, AS, that the relativised element can also be an adjunct of time, place or reason: