English verb conjugation
CAN SAIL

Regular verb: sail - sailed - sailed

Affirmation

Simple form	V-ing form
I can sail you can sail he can sail we can sail you can sail they can sail	I can be sailing you can be sailing he can be sailing we can be sailing you can be sailing they can be sailing
Perfect	V-ing perfect
I can have sailed you can have sailed he can have sailed we can have sailed you can have sailed they can have sailed	I can have been sailing you can have been sailing he can have been sailing we can have been sailing you can have been sailing they can have been sailing

Negation

Simple form	V-ing form
I can't sail you can't sail he can't sail we can't sail you can't sail they can't sail	I can't be sailing you can't be sailing he can't be sailing we can't be sailing you can't be sailing they can't be sailing
Perfect	V-ing perfect
I can't have sailed you can't have sailed he can't have sailed we can't have sailed you can't have sailed they can't have sailed	I can't have been sailing you can't have been sailing he can't have been sailing we can't have been sailing you can't have been sailing they can't have been sailing

Interrogative form

Simple form	V-ing form
can I sail? can you sail? can he sail? can we sail? can you sail? can they sail?	can I be sailing? can you be sailing? can he be sailing? can we be sailing? can you be sailing? can they be sailing?
Perfect	V-ing perfect
can I have sailed? can you have sailed? can he have sailed? can we have sailed? can you have sailed? can they have sailed?	can I have been sailing? can you have been sailing? can he have been sailing? can we have been sailing? can you have been sailing? can they have been sailing?

Interro-negative form

Simple form	V-ing form
can't I sail? can't you sail? can't he sail? can't we sail? can't you sail? can't they sail?	can't I be sailing? can't you be sailing? can't he be sailing? can't we be sailing? can't you be sailing? can't they be sailing?
Perfect	V-ing perfect
can't I have sailed? can't you have sailed? can't he have sailed? can't we have sailed? can't you have sailed? can't they have sailed?	can't I have been sailing? can't you have been sailing? can't he have been sailing? can't we have been sailing? can't you have been sailing? can't they have been sailing?