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 cannot clerk you cannot clerk he cannot clerk we cannot clerk you cannot clerk they cannot clerk	I cannot be clerking you cannot be clerking he cannot be clerking we cannot be clerking you cannot be clerking they cannot be clerking
Perfect	V-ing perfect
I cannot have clerked you cannot have clerked he cannot have clerked we cannot have clerked you cannot have clerked they cannot have clerked	I cannot have been clerking you cannot have been clerking he cannot have been clerking we cannot have been clerking you cannot have been clerking they cannot 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 I not clerk? can you not clerk? can he not clerk? can we not clerk? can you not clerk? can they not clerk?	can I not be clerking? can you not be clerking? can he not be clerking? can we not be clerking? can you not be clerking? can they not be clerking?
Perfect	V-ing perfect
can I not have clerked? can you not have clerked? can he not have clerked? can we not have clerked? can you not have clerked? can they not have clerked?	can I not have been clerking? can you not have been clerking? can he not have been clerking? can we not have been clerking? can you not have been clerking? can they not have been clerking?