could trip
Verbo regular: trip - tripped- tripped

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could trip
you could trip
she could trip
we could trip
you could trip
they could trip 	I could be tripping
you could be tripping
she could be tripping
we could be tripping
you could be tripping
they could be tripping	I could have tripped
you could have tripped
she could have tripped
we could have tripped
you could have tripped
they could have tripped	I could have been tripping
you could have been tripping
she could have been tripping
we could have been tripping
you could have been tripping
they could have been tripping	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not trip
you could not trip
she could not trip
we could not trip
you could not trip
they could not trip 	I could not be tripping
you could not be tripping
she could not be tripping
we could not be tripping
you could not be tripping
they could not be tripping	I could not have tripped
you could not have tripped
she could not have tripped
we could not have tripped
you could not have tripped
they could not have tripped	I could not have been tripping
you could not have been tripping
she could not have been tripping
we could not have been tripping
you could not have been tripping
they could not have been tripping	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I trip?
could you trip?
could she trip?
could we trip?
could you trip?
could they trip? 	could I be tripping?
could you be tripping?
could she be tripping?
could we be tripping?
could you be tripping?
could they be tripping? 	could I have tripped?
could you have tripped?
could she have tripped?
could we have tripped?
could you have tripped?
could they have tripped? 	could I have been tripping?
could you have been tripping?
could she have been tripping?
could we have been tripping?
could you have been tripping?
could they have been tripping? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not trip?
could you not trip?
could she not trip?
could we not trip?
could you not trip?
could they not trip? 	could I not be tripping?
could you not be tripping?
could she not be tripping?
could we not be tripping?
could you not be tripping?
could they not be tripping? 	could I not have tripped?
could you not have tripped?
could she not have tripped?
could we not have tripped?
could you not have tripped?
could they not have tripped? 	could I not have been tripping?
could you not have been tripping?
could she not have been tripping?
could we not have been tripping?
could you not have been tripping?
could they not have been tripping?