English verb conjugation
CAN CLASSIFY

Regular verb: classify - classified - classified

Affirmation

Simple form	V-ing form
I can classify you can classify he can classify we can classify you can classify they can classify	I can be classifying you can be classifying he can be classifying we can be classifying you can be classifying they can be classifying
Perfect	V-ing perfect
I can have classified you can have classified he can have classified we can have classified you can have classified they can have classified	I can have been classifying you can have been classifying he can have been classifying we can have been classifying you can have been classifying they can have been classifying

Negation

Simple form	V-ing form
I can't classify you can't classify he can't classify we can't classify you can't classify they can't classify	I can't be classifying you can't be classifying he can't be classifying we can't be classifying you can't be classifying they can't be classifying
Perfect	V-ing perfect
I can't have classified you can't have classified he can't have classified we can't have classified you can't have classified they can't have classified	I can't have been classifying you can't have been classifying he can't have been classifying we can't have been classifying you can't have been classifying they can't have been classifying

Interrogative form

Simple form	V-ing form
can I classify? can you classify? can he classify? can we classify? can you classify? can they classify?	can I be classifying? can you be classifying? can he be classifying? can we be classifying? can you be classifying? can they be classifying?
Perfect	V-ing perfect
can I have classified? can you have classified? can he have classified? can we have classified? can you have classified? can they have classified?	can I have been classifying? can you have been classifying? can he have been classifying? can we have been classifying? can you have been classifying? can they have been classifying?

Interro-negative form

Simple form	V-ing form
can't I classify? can't you classify? can't he classify? can't we classify? can't you classify? can't they classify?	can't I be classifying? can't you be classifying? can't he be classifying? can't we be classifying? can't you be classifying? can't they be classifying?
Perfect	V-ing perfect
can't I have classified? can't you have classified? can't he have classified? can't we have classified? can't you have classified? can't they have classified?	can't I have been classifying? can't you have been classifying? can't he have been classifying? can't we have been classifying? can't you have been classifying? can't they have been classifying?