English verb conjugation
COULD MORTAR

Regular verb: mortar - mortared - mortared

Affirmation

Simple form	V-ing form
I could mortar you could mortar he could mortar we could mortar you could mortar they could mortar	I could be mortaring you could be mortaring he could be mortaring we could be mortaring you could be mortaring they could be mortaring
Perfect	V-ing perfect
I could have mortared you could have mortared he could have mortared we could have mortared you could have mortared they could have mortared	I could have been mortaring you could have been mortaring he could have been mortaring we could have been mortaring you could have been mortaring they could have been mortaring

Negation

Simple form	V-ing form
I couldn't mortar you couldn't mortar he couldn't mortar we couldn't mortar you couldn't mortar they couldn't mortar	I couldn't be mortaring you couldn't be mortaring he couldn't be mortaring we couldn't be mortaring you couldn't be mortaring they couldn't be mortaring
Perfect	V-ing perfect
I couldn't have mortared you couldn't have mortared he couldn't have mortared we couldn't have mortared you couldn't have mortared they couldn't have mortared	I couldn't have been mortaring you couldn't have been mortaring he couldn't have been mortaring we couldn't have been mortaring you couldn't have been mortaring they couldn't have been mortaring

Interrogative form

Simple form	V-ing form
could I mortar? could you mortar? could he mortar? could we mortar? could you mortar? could they mortar?	could I be mortaring? could you be mortaring? could he be mortaring? could we be mortaring? could you be mortaring? could they be mortaring?
Perfect	V-ing perfect
could I have mortared? could you have mortared? could he have mortared? could we have mortared? could you have mortared? could they have mortared?	could I have been mortaring? could you have been mortaring? could he have been mortaring? could we have been mortaring? could you have been mortaring? could they have been mortaring?

Interro-negative form

Simple form	V-ing form
couldn't I mortar? couldn't you mortar? couldn't he mortar? couldn't we mortar? couldn't you mortar? couldn't they mortar?	couldn't I be mortaring? couldn't you be mortaring? couldn't he be mortaring? couldn't we be mortaring? couldn't you be mortaring? couldn't they be mortaring?
Perfect	V-ing perfect
couldn't I have mortared? couldn't you have mortared? couldn't he have mortared? couldn't we have mortared? couldn't you have mortared? couldn't they have mortared?	couldn't I have been mortaring? couldn't you have been mortaring? couldn't he have been mortaring? couldn't we have been mortaring? couldn't you have been mortaring? couldn't they have been mortaring?