So that they could observe that the adjective (green cube) could be epithet or attribute according to its place in the sentence.
They first created their own sentence in a free way by manipulating the blocks.
Then, they had to realize sentences by using for example 2 red cubes (adverbial phrase).
You can have a look at these previous entries related to this one:
Anne, I am going to add some links to your entry if you don't mind!
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