[clause] is a subject noun or noun phrase followed by a verb or verb
phrase:
is [verb]
has been [verb phrase]
grammar [noun],
a very easy grammar [noun phrase],
Noun phrase:
apple (noun),
some apples (determiner and noun),
some red apples (determiner,
adjective and noun),
some red apples which I am going to eat (determiner,
adjective, noun and relative clause).
