Noun Form Of Helpful. [adjective] of, relating to, or befitting a friend: In american english, most collective nouns are treated as singular, with a singular verb:
It is called regular plural nouns. This way of teaching target language can be helpful if the teacher thinks the learners may already know some of the target language. Generally, however, linguists look at forms like education system as compound nouns rather than an adjective + noun form.