English verb conjugation
SHOULD FASTEN

Regular verb: fasten - fastened - fastened

Affirmation

Simple form	V-ing form
I should fasten you should fasten he should fasten we should fasten you should fasten they should fasten	I should be fastening you should be fastening he should be fastening we should be fastening you should be fastening they should be fastening
Perfect	V-ing perfect
I should have fastened you should have fastened he should have fastened we should have fastened you should have fastened they should have fastened	I should have been fastening you should have been fastening he should have been fastening we should have been fastening you should have been fastening they should have been fastening

Negation

Simple form	V-ing form
I should not fasten you should not fasten he should not fasten we should not fasten you should not fasten they should not fasten	I should not be fastening you should not be fastening he should not be fastening we should not be fastening you should not be fastening they should not be fastening
Perfect	V-ing perfect
I should not have fastened you should not have fastened he should not have fastened we should not have fastened you should not have fastened they should not have fastened	I should not have been fastening you should not have been fastening he should not have been fastening we should not have been fastening you should not have been fastening they should not have been fastening

Interrogative form

Simple form	V-ing form
should I fasten? should you fasten? should he fasten? should we fasten? should you fasten? should they fasten?	should I be fastening? should you be fastening? should he be fastening? should we be fastening? should you be fastening? should they be fastening?
Perfect	V-ing perfect
should I have fastened? should you have fastened? should he have fastened? should we have fastened? should you have fastened? should they have fastened?	should I have been fastening? should you have been fastening? should he have been fastening? should we have been fastening? should you have been fastening? should they have been fastening?

Interro-negative form

Simple form	V-ing form
should I not fasten? should you not fasten? should he not fasten? should we not fasten? should you not fasten? should they not fasten?	should I not be fastening? should you not be fastening? should he not be fastening? should we not be fastening? should you not be fastening? should they not be fastening?
Perfect	V-ing perfect
should I not have fastened? should you not have fastened? should he not have fastened? should we not have fastened? should you not have fastened? should they not have fastened?	should I not have been fastening? should you not have been fastening? should he not have been fastening? should we not have been fastening? should you not have been fastening? should they not have been fastening?