English verb conjugation
SHOULD MASK

Regular verb: mask - masked - masked

Affirmation

Simple form	V-ing form
I should mask you should mask he should mask we should mask you should mask they should mask	I should be masking you should be masking he should be masking we should be masking you should be masking they should be masking
Perfect	V-ing perfect
I should have masked you should have masked he should have masked we should have masked you should have masked they should have masked	I should have been masking you should have been masking he should have been masking we should have been masking you should have been masking they should have been masking

Negation

Simple form	V-ing form
I should not mask you should not mask he should not mask we should not mask you should not mask they should not mask	I should not be masking you should not be masking he should not be masking we should not be masking you should not be masking they should not be masking
Perfect	V-ing perfect
I should not have masked you should not have masked he should not have masked we should not have masked you should not have masked they should not have masked	I should not have been masking you should not have been masking he should not have been masking we should not have been masking you should not have been masking they should not have been masking

Interrogative form

Simple form	V-ing form
should I mask? should you mask? should he mask? should we mask? should you mask? should they mask?	should I be masking? should you be masking? should he be masking? should we be masking? should you be masking? should they be masking?
Perfect	V-ing perfect
should I have masked? should you have masked? should he have masked? should we have masked? should you have masked? should they have masked?	should I have been masking? should you have been masking? should he have been masking? should we have been masking? should you have been masking? should they have been masking?

Interro-negative form

Simple form	V-ing form
should I not mask? should you not mask? should he not mask? should we not mask? should you not mask? should they not mask?	should I not be masking? should you not be masking? should he not be masking? should we not be masking? should you not be masking? should they not be masking?
Perfect	V-ing perfect
should I not have masked? should you not have masked? should he not have masked? should we not have masked? should you not have masked? should they not have masked?	should I not have been masking? should you not have been masking? should he not have been masking? should we not have been masking? should you not have been masking? should they not have been masking?