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