I can apperceive you can apperceive he can apperceive we can apperceive you can apperceive they can apperceive
V-ing form
I can be apperceiving you can be apperceiving he can be apperceiving we can be apperceiving you can be apperceiving they can be apperceiving
Perfect
I can have apperceived you can have apperceived he 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 he 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 he cannot apperceive we cannot apperceive you cannot apperceive they cannot apperceive
V-ing form
I cannot be apperceiving you cannot be apperceiving he cannot be apperceiving we cannot be apperceiving you cannot be apperceiving they cannot be apperceiving
Perfect
I cannot have apperceived you cannot have apperceived he 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 he 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 he apperceive? can we apperceive? can you apperceive? can they apperceive?
V-ing form
can I be apperceiving? can you be apperceiving? can he be apperceiving? can we be apperceiving? can you be apperceiving? can they be apperceiving?
Perfect
can I have apperceived? can you have apperceived? can he 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 he 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 he 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 he 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 he 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 he not have been apperceiving? can we not have been apperceiving? can you not have been apperceiving? can they not have been apperceiving?