PR are relations based on the principles of similarity. They exist between the units that can substitute one another. For instance, in the word-group A PINT OF MILK the word PINT is in paradigmatic relations with the words bottle, cup, etc. The article A can enter into PR with the units the, this, one, same, etc. According to different principles of similarity PR can be of three types:
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formal
are based on the similarity of forms. Such relations exist between the members of a paradigm: man – men; play – played – will play – is playing.
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functional
are based on the similarity of function. They are established between the elements that can occur in the same position. For instance, noun determiners: a, the, this, his, Ann’s, some, each, etc.
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