In «أَلَمْ تَرَ» the sākin mīm meets tāʾ; in «أَلَمْ يَجْعَلْ» it meets yāʾ. Both require clear mīm, iẓhār shafawī.
Neither context has the bāʾ needed for ikh-fāʾ shafawī nor the second mīm needed for idghām shafawī. Preserve mīm's lip articulation and avoid an added vowel or artificial nasal prolongation. Practise the word alone, then connect it to each different following word.
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Mīm sākinah before tāʾ and yāʾ
Al-Fīl and Quraysh: Applied Iẓhār, Ikhfāʾ, Idghām, Madd and Waqf
In «أَلَمْ تَرَ» the sākin mīm meets tāʾ; in «أَلَمْ يَجْعَلْ» it meets yāʾ. Both require clear mīm, iẓhār shafawī.
Neither context has the bāʾ needed for ikh-fāʾ shafawī nor the second mīm needed for idghām shafawī. Preserve mīm's lip articulation and avoid an added vowel or artificial nasal prolongation. Practise the word alone, then connect it to each different following word.