am、is、are、was和were是be的限定形式;being和been是非限定形式。
'Am', 'is', 'are', 'was' and 'were' are the finite forms of 'be'; 'being' and 'been' are the non-finite forms.
这些是一个动词的限定形式。
每一个英语句子都有唯一的一个限定形式的谓语中心成分,汉语句子则随意得多。
Each English sentence has a unique predicate head in a definite form while Chinese sentence has more flexible forms.
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