Translation of "Must've" in Arabic

- It must have been extremely painful.
- It must've been extremely painful.

لابد أنه كان مؤلماً للغاية

Leaving not one, but two armies in his rear must've seemed mad.

أن يترك جيشان خلفه يبدو في ظاهره جنونًا

His scouts must've informed him of the large force he would have to face,

لابد أن الكشافة أبلغوه بالقوة الكبيرة التي كان عليه مواجهتها