Must had vs must have [closed]
After modal auxiliary verbs like must, you use the plain form of the verb. But had is the past tense/participle form, so it can't go here. Only must have is correct.
Must had vs must have [closed]
After modal auxiliary verbs like must, you use the plain form of the verb. But had is the past tense/participle form, so it can't go here. Only must have is correct.