may be not 和 may not be . 有区别吗

may be not 和 may not be有区别。

May not be 再...都不为过。

May be not 也许不是。

may的其他短语：

may/might well+V原形：表“完全可能，很可能”= be very likely to：He may well be proud for his son。

may/might as well+V原形：“最好、蛮可以、倒不如”。

情态动词

①只做情态动词：may， might， must。

②可做情态动词又可做实义动词：如：need， dare，can。

③具有情态动词特征：have(had，has) to，used to， ought to。

④可做情态动词又可作助动词：如：shall(should)，will(would)。

may not be 是表示表示一种可能性,可能不是,而may be no表示肯定不是,例如
[1] She may be not a student, ...
Meaning => True, she is not a student, she's a teacher, but she works just as hard as a student. She studies English at home on her own time.
[2] She may not bea student.
Meaning => There is a possibility that she is not a student.

May not be 再...都不为过
May be not 也许不是
这是两个语法不同的现象