Try to avoid saying,
“You can’t …”
“You have to …”
“You mustn’t …”, instead,
you can say,
“… is not permitted.”
“We’d like all employees to …”

言わないようにしましょう。
"あなたはできない..."
"あなたがしなければならない..."
"You mustn't... "ではなく、代わりにこう言うことができます。
"許可されていません"
"全従業員に..."

Although all rules are important, it’s helpful to highlight the rules that are particularly important in your company.

すべてのルールは重要ですが、会社の中で特に重要なルールを強調しておくと便利です。

What are your company’s working hours?

9 A.M. to 6 P.M

Where is the smoking area in your company?

I don't know.

What is the dress code in your office?

Office casual.

What other general rules does your office have?

Be polite.