English verb conjugation
CAN SUCK

Regular verb: suck - sucked - sucked

Affirmation

Simple form	V-ing form
I can suck you can suck he can suck we can suck you can suck they can suck	I can be sucking you can be sucking he can be sucking we can be sucking you can be sucking they can be sucking
Perfect	V-ing perfect
I can have sucked you can have sucked he can have sucked we can have sucked you can have sucked they can have sucked	I can have been sucking you can have been sucking he can have been sucking we can have been sucking you can have been sucking they can have been sucking

Negation

Simple form	V-ing form
I cannot suck you cannot suck he cannot suck we cannot suck you cannot suck they cannot suck	I cannot be sucking you cannot be sucking he cannot be sucking we cannot be sucking you cannot be sucking they cannot be sucking
Perfect	V-ing perfect
I cannot have sucked you cannot have sucked he cannot have sucked we cannot have sucked you cannot have sucked they cannot have sucked	I cannot have been sucking you cannot have been sucking he cannot have been sucking we cannot have been sucking you cannot have been sucking they cannot have been sucking

Interrogative form

Simple form	V-ing form
can I suck? can you suck? can he suck? can we suck? can you suck? can they suck?	can I be sucking? can you be sucking? can he be sucking? can we be sucking? can you be sucking? can they be sucking?
Perfect	V-ing perfect
can I have sucked? can you have sucked? can he have sucked? can we have sucked? can you have sucked? can they have sucked?	can I have been sucking? can you have been sucking? can he have been sucking? can we have been sucking? can you have been sucking? can they have been sucking?

Interro-negative form

Simple form	V-ing form
can I not suck? can you not suck? can he not suck? can we not suck? can you not suck? can they not suck?	can I not be sucking? can you not be sucking? can he not be sucking? can we not be sucking? can you not be sucking? can they not be sucking?
Perfect	V-ing perfect
can I not have sucked? can you not have sucked? can he not have sucked? can we not have sucked? can you not have sucked? can they not have sucked?	can I not have been sucking? can you not have been sucking? can he not have been sucking? can we not have been sucking? can you not have been sucking? can they not have been sucking?