-Is there any flight to New York today?--I think there be for the weather is too bad.A m

问题补充：

-Is there any flight to New York today?

--I think there be, for the weather is too bad.

A mustn’t B may not C shouldn’t D can’t

答案：

解析：Shall和第三人称连用，疑问句形式用来征求听话人的意见。