2

What's the difference in these 2 sentences?

禁止します

禁止にします

3

禁止にします sounds like you will start to prohibit something, or you decided to prohibit something. This type of に is used in other set phrases related to making a decision (~に決める, ~に決定する). If something has been prohibited for a long time and it is going to be prohibited also in the future, then you have to say 禁止します. If you explicitly want to say you prohibit something from now on, 禁止します works but 禁止にします would be more natural.

  • タバコは禁止します。
    Smoking is prohibited. / We will prohibit smoking.
  • タバコは禁止にします。
    We will prohibit smoking. / We decided to prohibit smoking.

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