may sustain
Regular verb: sustain - sustained- sustained

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may sustain
you may sustain
he may sustain
we may sustain
you may sustain
they may sustain 	I may be sustaining
you may be sustaining
he may be sustaining
we may be sustaining
you may be sustaining
they may be sustaining	I may have sustained
you may have sustained
he may have sustained
we may have sustained
you may have sustained
they may have sustained	I may have been sustaining
you may have been sustaining
he may have been sustaining
we may have been sustaining
you may have been sustaining
they may have been sustaining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may not sustain
you may not sustain
he may not sustain
we may not sustain
you may not sustain
they may not sustain 	I may not be sustaining
you may not be sustaining
he may not be sustaining
we may not be sustaining
you may not be sustaining
they may not be sustaining	I may not have sustained
you may not have sustained
he may not have sustained
we may not have sustained
you may not have sustained
they may not have sustained	I may not have been sustaining
you may not have been sustaining
he may not have been sustaining
we may not have been sustaining
you may not have been sustaining
they may not have been sustaining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I sustain?
may you sustain?
may he sustain?
may we sustain?
may you sustain?
may they sustain? 	may I be sustaining?
may you be sustaining?
may he be sustaining?
may we be sustaining?
may you be sustaining?
may they be sustaining? 	may I have sustained?
may you have sustained?
may he have sustained?
may we have sustained?
may you have sustained?
may they have sustained? 	may I have been sustaining?
may you have been sustaining?
may he have been sustaining?
may we have been sustaining?
may you have been sustaining?
may they have been sustaining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I not sustain?
may you not sustain?
may he not sustain?
may we not sustain?
may you not sustain?
may they not sustain? 	may I not be sustaining?
may you not be sustaining?
may he not be sustaining?
may we not be sustaining?
may you not be sustaining?
may they not be sustaining? 	may I not have sustained?
may you not have sustained?
may he not have sustained?
may we not have sustained?
may you not have sustained?
may they not have sustained? 	may I not have been sustaining?
may you not have been sustaining?
may he not have been sustaining?
may we not have been sustaining?
may you not have been sustaining?
may they not have been sustaining?