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 cannot tower you cannot tower he cannot tower we cannot tower you cannot tower they cannot tower	I cannot be towering you cannot be towering he cannot be towering we cannot be towering you cannot be towering they cannot be towering
Perfect	V-ing perfect
I cannot have towered you cannot have towered he cannot have towered we cannot have towered you cannot have towered they cannot have towered	I cannot have been towering you cannot have been towering he cannot have been towering we cannot have been towering you cannot have been towering they cannot 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 I not tower? can you not tower? can he not tower? can we not tower? can you not tower? can they not tower?	can I not be towering? can you not be towering? can he not be towering? can we not be towering? can you not be towering? can they not be towering?
Perfect	V-ing perfect
can I not have towered? can you not have towered? can he not have towered? can we not have towered? can you not have towered? can they not have towered?	can I not have been towering? can you not have been towering? can he not have been towering? can we not have been towering? can you not have been towering? can they not have been towering?