Are these two sentences correct? [There are two activities in this class, climbing trees and crossing the river.] [There are two phrases in the book, "move forward" and "go ahead".] I think maybe an appositive cannot leave the modified word, so we can't write like that. So we only can write-[There are two activities, climbing trees and crossing the river, in the class] [There are two phrases, "move forward" and "go ahead", in the book.] Do you agree it?