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.

《牛津词典》

这些是一个动词的限定形式。

These are the finite forms of a verb.

youdao

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.

youdao

由于图形化语言仍然必须向计算机提供符号来进行编译和解释，因此我们需要采用图形化规范来限定形式语言的参数。

Because graphical languages still must provide symbols to the computer for compilation or interpretation, graphical specifications are still be required to follow formal language parameters.

youdao

由于图形化语言仍然必须向计算机提供符号来进行编译和解释，因此我们需要采用图形化规范来限定形式语言的参数。

Because graphical languages still must provide symbols to the computer for compilation or interpretation, graphical specifications are still be required to follow formal language parameters.

youdao