English verb conjugation
COULD MASON

Regular verb: mason - masoned - masoned

Affirmation

Simple form	V-ing form
I could mason you could mason he could mason we could mason you could mason they could mason	I could be masoning you could be masoning he could be masoning we could be masoning you could be masoning they could be masoning
Perfect	V-ing perfect
I could have masoned you could have masoned he could have masoned we could have masoned you could have masoned they could have masoned	I could have been masoning you could have been masoning he could have been masoning we could have been masoning you could have been masoning they could have been masoning

Negation

Simple form	V-ing form
I couldn't mason you couldn't mason he couldn't mason we couldn't mason you couldn't mason they couldn't mason	I couldn't be masoning you couldn't be masoning he couldn't be masoning we couldn't be masoning you couldn't be masoning they couldn't be masoning
Perfect	V-ing perfect
I couldn't have masoned you couldn't have masoned he couldn't have masoned we couldn't have masoned you couldn't have masoned they couldn't have masoned	I couldn't have been masoning you couldn't have been masoning he couldn't have been masoning we couldn't have been masoning you couldn't have been masoning they couldn't have been masoning

Interrogative form

Simple form	V-ing form
could I mason? could you mason? could he mason? could we mason? could you mason? could they mason?	could I be masoning? could you be masoning? could he be masoning? could we be masoning? could you be masoning? could they be masoning?
Perfect	V-ing perfect
could I have masoned? could you have masoned? could he have masoned? could we have masoned? could you have masoned? could they have masoned?	could I have been masoning? could you have been masoning? could he have been masoning? could we have been masoning? could you have been masoning? could they have been masoning?

Interro-negative form

Simple form	V-ing form
couldn't I mason? couldn't you mason? couldn't he mason? couldn't we mason? couldn't you mason? couldn't they mason?	couldn't I be masoning? couldn't you be masoning? couldn't he be masoning? couldn't we be masoning? couldn't you be masoning? couldn't they be masoning?
Perfect	V-ing perfect
couldn't I have masoned? couldn't you have masoned? couldn't he have masoned? couldn't we have masoned? couldn't you have masoned? couldn't they have masoned?	couldn't I have been masoning? couldn't you have been masoning? couldn't he have been masoning? couldn't we have been masoning? couldn't you have been masoning? couldn't they have been masoning?