Learn Farsi: ما باید از اعمال این قانون جلوگیری کنیم. - We must prevent the enforcement of this law.

The root of this word is ع م ل ('-m-l), which relates to action or work, as seen in the base noun عمل. By placing these three root consonants into the e-C1-C2-â-C3 pattern, we get اعمال (e'mâl). This pattern often expresses causation or bringing something into effect, which perfectly translates to 'enforcement' or 'application' in this context.

The word اعمال looks identical to the Arabic broken plural for 'actions'. How do we know which meaning is intended here?

You must rely on context and pronunciation. The plural for 'actions' is pronounced a'mâl. However, as a Form IV noun meaning 'enforcement', it follows the e-C1-C2-â-C3 pattern and is pronounced e'mâl. The context of dealing with a law (قانون) makes 'enforcement' the only logical choice.

Why is the preposition از (from) used before the noun phrase here?

The compound verb جلوگیری کردن (to prevent) requires the preposition از to introduce the thing being prevented. Even though English says 'prevent the enforcement', Farsi phrases this as 'prevent from the enforcement'.

As a quick refresher, why is the final verb کنیم instead of the indicative می‌کنیم?

The sentence uses the modal verb باید (must). In Farsi grammar, باید always requires the following main verb to take the subjunctive mood.