English verb conjugation
CAN TOWER

Regular verb: tower - towered - towered

Affirmation

Simple form	V-ing form
I can tower you can tower he can tower we can tower you can tower they can tower	I can be towering you can be towering he can be towering we can be towering you can be towering they can be towering
Perfect	V-ing perfect
I can have towered you can have towered he can have towered we can have towered you can have towered they can have towered	I can have been towering you can have been towering he can have been towering we can have been towering you can have been towering they can have been towering

Negation

Simple form	V-ing form
I can't tower you can't tower he can't tower we can't tower you can't tower they can't tower	I can't be towering you can't be towering he can't be towering we can't be towering you can't be towering they can't be towering
Perfect	V-ing perfect
I can't have towered you can't have towered he can't have towered we can't have towered you can't have towered they can't have towered	I can't have been towering you can't have been towering he can't have been towering we can't have been towering you can't have been towering they can't have been towering

Interrogative form

Simple form	V-ing form
can I tower? can you tower? can he tower? can we tower? can you tower? can they tower?	can I be towering? can you be towering? can he be towering? can we be towering? can you be towering? can they be towering?
Perfect	V-ing perfect
can I have towered? can you have towered? can he have towered? can we have towered? can you have towered? can they have towered?	can I have been towering? can you have been towering? can he have been towering? can we have been towering? can you have been towering? can they have been towering?

Interro-negative form

Simple form	V-ing form
can't I tower? can't you tower? can't he tower? can't we tower? can't you tower? can't they tower?	can't I be towering? can't you be towering? can't he be towering? can't we be towering? can't you be towering? can't they be towering?
Perfect	V-ing perfect
can't I have towered? can't you have towered? can't he have towered? can't we have towered? can't you have towered? can't they have towered?	can't I have been towering? can't you have been towering? can't he have been towering? can't we have been towering? can't you have been towering? can't they have been towering?