ثَقَبْتُمْ • (ṯaqabtum) (form I)
ثُقِبْتُمْ • (ṯuqibtum) (form I)
ثَقَّبْتُمْ • (ṯaqqabtum) (form II)
ثُقِّبْتُمْ • (ṯuqqibtum) (form II)