might sustain
Regular verb: sustain - sustained- sustained

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mightn't sustain
you mightn't sustain
she mightn't sustain
we mightn't sustain
you mightn't sustain
they mightn't sustain 	I mightn't be sustaining
you mightn't be sustaining
she mightn't be sustaining
we mightn't be sustaining
you mightn't be sustaining
they mightn't be sustaining	I mightn't have sustained
you mightn't have sustained
she mightn't have sustained
we mightn't have sustained
you mightn't have sustained
they mightn't have sustained	I mightn't have been sustaining
you mightn't have been sustaining
she mightn't have been sustaining
we mightn't have been sustaining
you mightn't have been sustaining
they mightn't have been sustaining	

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

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mightn't I sustain?
mightn't you sustain?
mightn't she sustain?
mightn't we sustain?
mightn't you sustain?
mightn't they sustain? 	mightn't I be sustaining?
mightn't you be sustaining?
mightn't she be sustaining?
mightn't we be sustaining?
mightn't you be sustaining?
mightn't they be sustaining? 	mightn't I have sustained?
mightn't you have sustained?
mightn't she have sustained?
mightn't we have sustained?
mightn't you have sustained?
mightn't they have sustained? 	mightn't I have been sustaining?
mightn't you have been sustaining?
mightn't she have been sustaining?
mightn't we have been sustaining?
mightn't you have been sustaining?
mightn't they have been sustaining?