English verb conjugation
CAN SERVE

Regular verb: serve - served - served

Affirmation

Simple form	V-ing form
I can serve you can serve he can serve we can serve you can serve they can serve	I can be serving you can be serving he can be serving we can be serving you can be serving they can be serving
Perfect	V-ing perfect
I can have served you can have served he can have served we can have served you can have served they can have served	I can have been serving you can have been serving he can have been serving we can have been serving you can have been serving they can have been serving

Negation

Simple form	V-ing form
I can't serve you can't serve he can't serve we can't serve you can't serve they can't serve	I can't be serving you can't be serving he can't be serving we can't be serving you can't be serving they can't be serving
Perfect	V-ing perfect
I can't have served you can't have served he can't have served we can't have served you can't have served they can't have served	I can't have been serving you can't have been serving he can't have been serving we can't have been serving you can't have been serving they can't have been serving

Interrogative form

Simple form	V-ing form
can I serve? can you serve? can he serve? can we serve? can you serve? can they serve?	can I be serving? can you be serving? can he be serving? can we be serving? can you be serving? can they be serving?
Perfect	V-ing perfect
can I have served? can you have served? can he have served? can we have served? can you have served? can they have served?	can I have been serving? can you have been serving? can he have been serving? can we have been serving? can you have been serving? can they have been serving?

Interro-negative form

Simple form	V-ing form
can't I serve? can't you serve? can't he serve? can't we serve? can't you serve? can't they serve?	can't I be serving? can't you be serving? can't he be serving? can't we be serving? can't you be serving? can't they be serving?
Perfect	V-ing perfect
can't I have served? can't you have served? can't he have served? can't we have served? can't you have served? can't they have served?	can't I have been serving? can't you have been serving? can't he have been serving? can't we have been serving? can't you have been serving? can't they have been serving?