'Against' can be used as a preposition to indicate a state of opposition or confrontation. It is often used with 'be' in order to indicate a strong sense of opposition.
'Against' should be followed by a noun or pronoun. 'Against' should be followed by a verb or action. The subject in the sentence should always precede 'against'.
1. She is against the new government policies.
2. He is strongly against spending more money.
3. We are against anyone who discriminates against other people.
It is important to note that 'against' should always be followed by a noun or pronoun, and should never be used as a standalone preposition. Additionally, it is more correct to use 'against' instead of 'versus' when expressing a strong point of opposition.