Learn Arabic (Modern Standard): لا يمكن للساحر أن يقف في الحلبة الآن. - The magician cannot stand in the ring now.

In Arabic, يمكن is an impersonal verb meaning "it is possible." To say someone "can" or "cannot" do something, you literally say "it is not possible for [someone] to..." using the preposition لـ (for). So, "the magician cannot" is phrased as لا يمكن للساحر أن (literally: "it is not possible for the magician to").

Why is للساحر written with two ل letters in a row?

The word for "the magician" is الساحر. When we attach the preposition لـ (for) to a word that starts with the definite article الـ (the), the alif (ا) is dropped in spelling. Therefore, لـ + الساحر becomes للساحر.

Why does the verb يقف (he stands) change its ending here?

Because it comes directly after أن. The particle أن forces the following present tense verb into the subjunctive mood. For a standard verb like يقف, this means its default 'u' sound at the end changes to a short 'a' sound (fatha), making it يقفَ.

Why does the word for "now" (الآن) end with a fatha (short 'a' sound) here?

Unlike most nouns and adjectives that change their vowel endings based on their grammar role in the sentence, الآن is a "fixed" word. It always keeps the fatha ending, no matter where it is placed.