English verb conjugation
SHOULD SUSTAIN

Regular verb: sustain - sustained - sustained

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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