can singe
Verbo regular: singe - singed- singed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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	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	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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	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	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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? 	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? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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? 	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?