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