I must apperceive you must apperceive she must apperceive we must apperceive you must apperceive they must apperceive
V-ing form
I must be apperceiving you must be apperceiving she must be apperceiving we must be apperceiving you must be apperceiving they must be apperceiving
Perfect
I must have apperceived you must have apperceived she must have apperceived we must have apperceived you must have apperceived they must have apperceived
V-ing perfect
I must have been apperceiving you must have been apperceiving she must have been apperceiving we must have been apperceiving you must have been apperceiving they must have been apperceiving
Negation
Simple form
I must not apperceive you must not apperceive she must not apperceive we must not apperceive you must not apperceive they must not apperceive
V-ing form
I must not be apperceiving you must not be apperceiving she must not be apperceiving we must not be apperceiving you must not be apperceiving they must not be apperceiving
Perfect
I must not have apperceived you must not have apperceived she must not have apperceived we must not have apperceived you must not have apperceived they must not have apperceived
V-ing perfect
I must not have been apperceiving you must not have been apperceiving she must not have been apperceiving we must not have been apperceiving you must not have been apperceiving they must not have been apperceiving
Interrogative form
Simple form
must I apperceive? must you apperceive? must she apperceive? must we apperceive? must you apperceive? must they apperceive?
V-ing form
must I be apperceiving? must you be apperceiving? must she be apperceiving? must we be apperceiving? must you be apperceiving? must they be apperceiving?
Perfect
must I have apperceived? must you have apperceived? must she have apperceived? must we have apperceived? must you have apperceived? must they have apperceived?
V-ing perfect
must I have been apperceiving? must you have been apperceiving? must she have been apperceiving? must we have been apperceiving? must you have been apperceiving? must they have been apperceiving?
Interro-negative form
Simple form
must I not apperceive? must you not apperceive? must she not apperceive? must we not apperceive? must you not apperceive? must they not apperceive?
V-ing form
must I not be apperceiving? must you not be apperceiving? must she not be apperceiving? must we not be apperceiving? must you not be apperceiving? must they not be apperceiving?
Perfect
must I not have apperceived? must you not have apperceived? must she not have apperceived? must we not have apperceived? must you not have apperceived? must they not have apperceived?
V-ing perfect
must I not have been apperceiving? must you not have been apperceiving? must she not have been apperceiving? must we not have been apperceiving? must you not have been apperceiving? must they not have been apperceiving?