لِمَن شَآءَ مِنكُمْ أَن يَسْتَقِيمَ ۝٢٨ What makes يَسْتَقِيمَ subjunctive?

Surah At-Takwir — Part 4

• The verb shāʾa
• The preceding particle an
• The preposition min
• The negative particle in