English verb conjugation
CAN PIECE

Regular verb: piece - pieced - pieced

Affirmation

Simple form	V-ing form
I can piece you can piece he can piece we can piece you can piece they can piece	I can be piecing you can be piecing he can be piecing we can be piecing you can be piecing they can be piecing
Perfect	V-ing perfect
I can have pieced you can have pieced he can have pieced we can have pieced you can have pieced they can have pieced	I can have been piecing you can have been piecing he can have been piecing we can have been piecing you can have been piecing they can have been piecing

Negation

Simple form	V-ing form
I cannot piece you cannot piece he cannot piece we cannot piece you cannot piece they cannot piece	I cannot be piecing you cannot be piecing he cannot be piecing we cannot be piecing you cannot be piecing they cannot be piecing
Perfect	V-ing perfect
I cannot have pieced you cannot have pieced he cannot have pieced we cannot have pieced you cannot have pieced they cannot have pieced	I cannot have been piecing you cannot have been piecing he cannot have been piecing we cannot have been piecing you cannot have been piecing they cannot have been piecing

Interrogative form

Simple form	V-ing form
can I piece? can you piece? can he piece? can we piece? can you piece? can they piece?	can I be piecing? can you be piecing? can he be piecing? can we be piecing? can you be piecing? can they be piecing?
Perfect	V-ing perfect
can I have pieced? can you have pieced? can he have pieced? can we have pieced? can you have pieced? can they have pieced?	can I have been piecing? can you have been piecing? can he have been piecing? can we have been piecing? can you have been piecing? can they have been piecing?

Interro-negative form

Simple form	V-ing form
can I not piece? can you not piece? can he not piece? can we not piece? can you not piece? can they not piece?	can I not be piecing? can you not be piecing? can he not be piecing? can we not be piecing? can you not be piecing? can they not be piecing?
Perfect	V-ing perfect
can I not have pieced? can you not have pieced? can he not have pieced? can we not have pieced? can you not have pieced? can they not have pieced?	can I not have been piecing? can you not have been piecing? can he not have been piecing? can we not have been piecing? can you not have been piecing? can they not have been piecing?