Discussion on question by xiumai: Using two auxiliary verbs in one sentence

@user178049 Calling "be" an auxiliary because it has the NICE properties is confusing and misleading. In ordinary English usage, we don't call the main verb of a sentence auxiliary. Correct would be to say that "A certain esoteric grammar terminology, hardly in use by anybody who knows English, would call 'be' auxiliary here." If the CGEL people wanted to define a category of verbs by the NICE properties, they should have called them NICE verbs instead of redefining "auxiliary". Hell, even computer programmers take more care when naming things.