English verb conjugation
CAN CONCENTER

Regular verb: concenter - concentered - concentered

Affirmation

Simple form	V-ing form
I can concenter you can concenter he can concenter we can concenter you can concenter they can concenter	I can be concentering you can be concentering he can be concentering we can be concentering you can be concentering they can be concentering
Perfect	V-ing perfect
I can have concentered you can have concentered he can have concentered we can have concentered you can have concentered they can have concentered	I can have been concentering you can have been concentering he can have been concentering we can have been concentering you can have been concentering they can have been concentering

Negation

Simple form	V-ing form
I can't concenter you can't concenter he can't concenter we can't concenter you can't concenter they can't concenter	I can't be concentering you can't be concentering he can't be concentering we can't be concentering you can't be concentering they can't be concentering
Perfect	V-ing perfect
I can't have concentered you can't have concentered he can't have concentered we can't have concentered you can't have concentered they can't have concentered	I can't have been concentering you can't have been concentering he can't have been concentering we can't have been concentering you can't have been concentering they can't have been concentering

Interrogative form

Simple form	V-ing form
can I concenter? can you concenter? can he concenter? can we concenter? can you concenter? can they concenter?	can I be concentering? can you be concentering? can he be concentering? can we be concentering? can you be concentering? can they be concentering?
Perfect	V-ing perfect
can I have concentered? can you have concentered? can he have concentered? can we have concentered? can you have concentered? can they have concentered?	can I have been concentering? can you have been concentering? can he have been concentering? can we have been concentering? can you have been concentering? can they have been concentering?

Interro-negative form

Simple form	V-ing form
can't I concenter? can't you concenter? can't he concenter? can't we concenter? can't you concenter? can't they concenter?	can't I be concentering? can't you be concentering? can't he be concentering? can't we be concentering? can't you be concentering? can't they be concentering?
Perfect	V-ing perfect
can't I have concentered? can't you have concentered? can't he have concentered? can't we have concentered? can't you have concentered? can't they have concentered?	can't I have been concentering? can't you have been concentering? can't he have been concentering? can't we have been concentering? can't you have been concentering? can't they have been concentering?