7. In English syntactic analysis, four phrasal categories are commonly recognized and discussed, namely, noun phrase, verb phrase, infinitive phrase, and auxiliary phrase.
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6. In most cases, prefixes change the meaning of the base whereas suffixes change the word-class of the base.
5. A lexeme has many word forms, for example, walked, walking, and works are all words forms of walk.
4. Sounds in complementary distribution must be allophones.
Which of the following words is entirely arbitrary? ( )
A. bird
B. typewriter
C. crash
D. bang