may concentrate
Verbo regular: concentrate - concentrated- concentrated

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I may concentrate
you may concentrate
he may concentrate
we may concentrate
you may concentrate
they may concentrate 	I may be concentrating
you may be concentrating
he may be concentrating
we may be concentrating
you may be concentrating
they may be concentrating	I may have concentrated
you may have concentrated
he may have concentrated
we may have concentrated
you may have concentrated
they may have concentrated	I may have been concentrating
you may have been concentrating
he may have been concentrating
we may have been concentrating
you may have been concentrating
they may have been concentrating	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I may not concentrate
you may not concentrate
he may not concentrate
we may not concentrate
you may not concentrate
they may not concentrate 	I may not be concentrating
you may not be concentrating
he may not be concentrating
we may not be concentrating
you may not be concentrating
they may not be concentrating	I may not have concentrated
you may not have concentrated
he may not have concentrated
we may not have concentrated
you may not have concentrated
they may not have concentrated	I may not have been concentrating
you may not have been concentrating
he may not have been concentrating
we may not have been concentrating
you may not have been concentrating
they may not have been concentrating	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
may I concentrate?
may you concentrate?
may he concentrate?
may we concentrate?
may you concentrate?
may they concentrate? 	may I be concentrating?
may you be concentrating?
may he be concentrating?
may we be concentrating?
may you be concentrating?
may they be concentrating? 	may I have concentrated?
may you have concentrated?
may he have concentrated?
may we have concentrated?
may you have concentrated?
may they have concentrated? 	may I have been concentrating?
may you have been concentrating?
may he have been concentrating?
may we have been concentrating?
may you have been concentrating?
may they have been concentrating? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
may I not concentrate?
may you not concentrate?
may he not concentrate?
may we not concentrate?
may you not concentrate?
may they not concentrate? 	may I not be concentrating?
may you not be concentrating?
may he not be concentrating?
may we not be concentrating?
may you not be concentrating?
may they not be concentrating? 	may I not have concentrated?
may you not have concentrated?
may he not have concentrated?
may we not have concentrated?
may you not have concentrated?
may they not have concentrated? 	may I not have been concentrating?
may you not have been concentrating?
may he not have been concentrating?
may we not have been concentrating?
may you not have been concentrating?
may they not have been concentrating?