English verb conjugation
CAN RETRIEVE

Regular verb: retrieve - retrieved - retrieved

Affirmation

Simple form	V-ing form
I can retrieve you can retrieve he can retrieve we can retrieve you can retrieve they can retrieve	I can be retrieving you can be retrieving he can be retrieving we can be retrieving you can be retrieving they can be retrieving
Perfect	V-ing perfect
I can have retrieved you can have retrieved he can have retrieved we can have retrieved you can have retrieved they can have retrieved	I can have been retrieving you can have been retrieving he can have been retrieving we can have been retrieving you can have been retrieving they can have been retrieving

Negation

Simple form	V-ing form
I can't retrieve you can't retrieve he can't retrieve we can't retrieve you can't retrieve they can't retrieve	I can't be retrieving you can't be retrieving he can't be retrieving we can't be retrieving you can't be retrieving they can't be retrieving
Perfect	V-ing perfect
I can't have retrieved you can't have retrieved he can't have retrieved we can't have retrieved you can't have retrieved they can't have retrieved	I can't have been retrieving you can't have been retrieving he can't have been retrieving we can't have been retrieving you can't have been retrieving they can't have been retrieving

Interrogative form

Simple form	V-ing form
can I retrieve? can you retrieve? can he retrieve? can we retrieve? can you retrieve? can they retrieve?	can I be retrieving? can you be retrieving? can he be retrieving? can we be retrieving? can you be retrieving? can they be retrieving?
Perfect	V-ing perfect
can I have retrieved? can you have retrieved? can he have retrieved? can we have retrieved? can you have retrieved? can they have retrieved?	can I have been retrieving? can you have been retrieving? can he have been retrieving? can we have been retrieving? can you have been retrieving? can they have been retrieving?

Interro-negative form

Simple form	V-ing form
can't I retrieve? can't you retrieve? can't he retrieve? can't we retrieve? can't you retrieve? can't they retrieve?	can't I be retrieving? can't you be retrieving? can't he be retrieving? can't we be retrieving? can't you be retrieving? can't they be retrieving?
Perfect	V-ing perfect
can't I have retrieved? can't you have retrieved? can't he have retrieved? can't we have retrieved? can't you have retrieved? can't they have retrieved?	can't I have been retrieving? can't you have been retrieving? can't he have been retrieving? can't we have been retrieving? can't you have been retrieving? can't they have been retrieving?