فَتَحَ — يَفْتَحُ — فَتْحًا
He opened — he opens — opening.
The second radical carries fatḥah in both perfect and imperfect; the pattern is فَعَلَ يَفْعَلُ.
مَنَعَ يَمْنَعُ — prevented / prevents.
ذَهَبَ يَذْهَبُ — went / goes.
The imperfect of samiʿa also has fatḥah on the second radical, but samiʿa has perfect faʿila whereas fataḥa has faʿala. The full vowel pairing determines the class.
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Class 4: fataḥa–yaftaḥu
Verb Classes and the Six Unaugmented Triliteral Patterns
فَتَحَ — يَفْتَحُ — فَتْحًا
He opened — he opens — opening.
The second radical carries fatḥah in both perfect and imperfect; the pattern is فَعَلَ يَفْعَلُ.
مَنَعَ يَمْنَعُ — prevented / prevents.
ذَهَبَ يَذْهَبُ — went / goes.
The imperfect of samiʿa also has fatḥah on the second radical, but samiʿa has perfect faʿila whereas fataḥa has faʿala. The full vowel pairing determines the class.