can descend
Regular verb: descend - descended- descended

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can descend
you can descend
he can descend
we can descend
you can descend
they can descend 	I can be descending
you can be descending
he can be descending
we can be descending
you can be descending
they can be descending	I can have descended
you can have descended
he can have descended
we can have descended
you can have descended
they can have descended	I can have been descending
you can have been descending
he can have been descending
we can have been descending
you can have been descending
they can have been descending	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't descend
you can't descend
he can't descend
we can't descend
you can't descend
they can't descend 	I can't be descending
you can't be descending
he can't be descending
we can't be descending
you can't be descending
they can't be descending	I can't have descended
you can't have descended
he can't have descended
we can't have descended
you can't have descended
they can't have descended	I can't have been descending
you can't have been descending
he can't have been descending
we can't have been descending
you can't have been descending
they can't have been descending	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I descend?
can you descend?
can he descend?
can we descend?
can you descend?
can they descend? 	can I be descending?
can you be descending?
can he be descending?
can we be descending?
can you be descending?
can they be descending? 	can I have descended?
can you have descended?
can he have descended?
can we have descended?
can you have descended?
can they have descended? 	can I have been descending?
can you have been descending?
can he have been descending?
can we have been descending?
can you have been descending?
can they have been descending? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I descend?
can't you descend?
can't he descend?
can't we descend?
can't you descend?
can't they descend? 	can't I be descending?
can't you be descending?
can't he be descending?
can't we be descending?
can't you be descending?
can't they be descending? 	can't I have descended?
can't you have descended?
can't he have descended?
can't we have descended?
can't you have descended?
can't they have descended? 	can't I have been descending?
can't you have been descending?
can't he have been descending?
can't we have been descending?
can't you have been descending?
can't they have been descending?