pink"), you do not make good sense (for how can a Thing be an Attribute?) unless you have an understanding with the person to whom you are speaking. And the simplest understanding would, I think, be this——that the Substantive shall be supposed to be repeated at the end of the sentence, so that the sentence, if written out in full, would be "some Pigs are pink (Pigs)". And now the word "are" makes quite good sense.
Thus, in order to make good sense of the Proposition "some new Cakes are nice", we must suppose it to be written out in full, in the form "some new Cakes are nice (Cakes)". Now this contains two 'Terms'——"new Cakes" being one of them, and "nice (Cakes)" the other. "New Cakes," being the one we are talking about, is called the 'Subject' of the Proposition, and "nice (Cakes)" the 'Predicate'. Also this Proposition is said to be a 'Particular' one, since it does not speak of the whole of its Subject, but only of a part of it. The other two kinds are said to be 'Universal', because they speak of the whole of their Subjects——the one denying niceness, and the other asserting it, of the whole class of "new Cakes". Lastly, if you would like to have a definition of the word 'Proposition' itself, you may take this:—"a sentence stating that some, or none, or all, of the Things belonging to a certain class, called its 'Subject', are also Things belonging to a certain other class, called its 'Predicate'".