I shall bring it about that the citizens not fight among themselves.
2.See to it that you not abandon the allies, o soldiers.
為什么這兩個句子的從句都用not +動詞原形，為什么不是　do not +動詞原形？

這是虛擬語氣的用法嗎？bring about 和 see to it that 后要用虛擬語氣嗎？