English verb conjugation
CAN SINGE

Regular verb: singe - singed - singed

Affirmation

Simple form	V-ing form
I can singe you can singe he can singe we can singe you can singe they can singe	I can be singing you can be singing he can be singing we can be singing you can be singing they can be singing
Perfect	V-ing perfect
I can have singed you can have singed he can have singed we can have singed you can have singed they can have singed	I can have been singing you can have been singing he can have been singing we can have been singing you can have been singing they can have been singing

Negation

Simple form	V-ing form
I cannot singe you cannot singe he cannot singe we cannot singe you cannot singe they cannot singe	I cannot be singing you cannot be singing he cannot be singing we cannot be singing you cannot be singing they cannot be singing
Perfect	V-ing perfect
I cannot have singed you cannot have singed he cannot have singed we cannot have singed you cannot have singed they cannot have singed	I cannot have been singing you cannot have been singing he cannot have been singing we cannot have been singing you cannot have been singing they cannot have been singing

Interrogative form

Simple form	V-ing form
can I singe? can you singe? can he singe? can we singe? can you singe? can they singe?	can I be singing? can you be singing? can he be singing? can we be singing? can you be singing? can they be singing?
Perfect	V-ing perfect
can I have singed? can you have singed? can he have singed? can we have singed? can you have singed? can they have singed?	can I have been singing? can you have been singing? can he have been singing? can we have been singing? can you have been singing? can they have been singing?

Interro-negative form

Simple form	V-ing form
can I not singe? can you not singe? can he not singe? can we not singe? can you not singe? can they not singe?	can I not be singing? can you not be singing? can he not be singing? can we not be singing? can you not be singing? can they not be singing?
Perfect	V-ing perfect
can I not have singed? can you not have singed? can he not have singed? can we not have singed? can you not have singed? can they not have singed?	can I not have been singing? can you not have been singing? can he not have been singing? can we not have been singing? can you not have been singing? can they not have been singing?