protasis

As to dynamic modality, it can always be hypothesized in a conditional protasis, is always subject to tense distinction, and does not shift its orientation under the influence of interrogation.

受到时态的影响；不会因为疑问而转移方向，指向受话者。从功能讲，机能情态不表达说话者对话语内容的任何态度，而本身属于话语命题内容。