English verb conjugation
CAN CLERK

Regular verb: clerk - clerked - clerked

Affirmation

Simple form	V-ing form
I can clerk you can clerk he can clerk we can clerk you can clerk they can clerk	I can be clerking you can be clerking he can be clerking we can be clerking you can be clerking they can be clerking
Perfect	V-ing perfect
I can have clerked you can have clerked he can have clerked we can have clerked you can have clerked they can have clerked	I can have been clerking you can have been clerking he can have been clerking we can have been clerking you can have been clerking they can have been clerking

Negation

Simple form	V-ing form
I can't clerk you can't clerk he can't clerk we can't clerk you can't clerk they can't clerk	I can't be clerking you can't be clerking he can't be clerking we can't be clerking you can't be clerking they can't be clerking
Perfect	V-ing perfect
I can't have clerked you can't have clerked he can't have clerked we can't have clerked you can't have clerked they can't have clerked	I can't have been clerking you can't have been clerking he can't have been clerking we can't have been clerking you can't have been clerking they can't have been clerking

Interrogative form

Simple form	V-ing form
can I clerk? can you clerk? can he clerk? can we clerk? can you clerk? can they clerk?	can I be clerking? can you be clerking? can he be clerking? can we be clerking? can you be clerking? can they be clerking?
Perfect	V-ing perfect
can I have clerked? can you have clerked? can he have clerked? can we have clerked? can you have clerked? can they have clerked?	can I have been clerking? can you have been clerking? can he have been clerking? can we have been clerking? can you have been clerking? can they have been clerking?

Interro-negative form

Simple form	V-ing form
can't I clerk? can't you clerk? can't he clerk? can't we clerk? can't you clerk? can't they clerk?	can't I be clerking? can't you be clerking? can't he be clerking? can't we be clerking? can't you be clerking? can't they be clerking?
Perfect	V-ing perfect
can't I have clerked? can't you have clerked? can't he have clerked? can't we have clerked? can't you have clerked? can't they have clerked?	can't I have been clerking? can't you have been clerking? can't he have been clerking? can't we have been clerking? can't you have been clerking? can't they have been clerking?