يَفْتَحُ has fatḥah on its middle root letter, so the imperative begins with kasrah.
اِفْتَحْ — اِفْتَحَا — اِفْتَحُوا
اِفْتَحِي — اِفْتَحَا — اِفْتَحْنَ
اللَّهُمَّ افْتَحْ لِي أَبْوَابَ رَحْمَتِكَ
O Allah, open for me the doors of Your mercy.
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The Pattern with اِفْتَحْ
The Imperative: Formation and Six Forms
يَفْتَحُ has fatḥah on its middle root letter, so the imperative begins with kasrah.
اِفْتَحْ — اِفْتَحَا — اِفْتَحُوا
اِفْتَحِي — اِفْتَحَا — اِفْتَحْنَ
اللَّهُمَّ افْتَحْ لِي أَبْوَابَ رَحْمَتِكَ
O Allah, open for me the doors of Your mercy.