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فور حل اللغز، يتوقف الليزر.

فور حل اللغز، يتوقف الليزر.fawra halli l-lughzi, yatawaqqafu l-layzaru
Immediately after solving the puzzle, the laser stops.
From Lesson 460:Immediate sequence (بمجرد أن / فورَ)·Arabic (Modern Standard)

Questions & Answers about فور حل اللغز، يتوقف الليزر.

Why do we use the noun حل (solving) here instead of a verb?
The word فور must be followed by an Idafa (genitive construction). This means it requires a noun or a Masdar (verbal noun) right after it, never a conjugated verb. If you wanted to use a verb instead, you would use بمجرد أن followed by the verb.
Is حل a noun or a verb here? It looks exactly like the past tense verb 'he solved'.
In this sentence, حل is a Masdar (verbal noun) meaning 'solving' or 'solution'. Because Arabic often drops short vowels in writing, it looks identical to the Form I past tense verb حلّ (he solved). However, since it comes directly after فور, you know it has to be the noun form.
What is the grammatical relationship between حل and اللغز?
They form an Idafa (construct phrase). حل (solving) is the Mudaf (the first term in the construct) and اللغز (the puzzle) is the Mudaf Ilayh (the second term). Because it is the second part of the Idafa, اللغز is in the genitive case (majrur) and takes a Kasra.
If I wanted to say 'Immediately after solving the puzzle, the laser STOPPED' (in the past), would the first part of the sentence change?
No, the first part (فور حل اللغز) remains exactly the same because حل is a verbal noun and doesn't carry a specific tense. You would only change the main verb to the past tense, making it توقف الليزر.

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