题目

the method of ratification being determined by Congress at the time of proposal.这为什么是being?
Before an amendment can take effect,it must be proposed to the states by a two-thirds vote of both houses of Congress or by a convention called by two-thirds of the states,and ratified by three-fourths of the states or by three-fourths of conventions thereof,the method of ratification being determined by Congress at the time of proposal.
这里是上下文,为什么不是is?而是being?

提问时间：2020-12-10

答案

the method of ratification being determined by Congress at the time of proposal.
这是独立主格结构.变成谓语句子结构是：AND therefore the method of ratification IS determined by Congress at the time of proposal.
--------需要有and作为“连接词”.