I can mortar you can mortar he can mortar we can mortar you can mortar they can mortar
V-ing form
I can be mortaring you can be mortaring he can be mortaring we can be mortaring you can be mortaring they can be mortaring
Perfect
I can have mortared you can have mortared he can have mortared we can have mortared you can have mortared they can have mortared
V-ing perfect
I can have been mortaring you can have been mortaring he can have been mortaring we can have been mortaring you can have been mortaring they can have been mortaring
Negation
Simple form
I cannot mortar you cannot mortar he cannot mortar we cannot mortar you cannot mortar they cannot mortar
V-ing form
I cannot be mortaring you cannot be mortaring he cannot be mortaring we cannot be mortaring you cannot be mortaring they cannot be mortaring
Perfect
I cannot have mortared you cannot have mortared he cannot have mortared we cannot have mortared you cannot have mortared they cannot have mortared
V-ing perfect
I cannot have been mortaring you cannot have been mortaring he cannot have been mortaring we cannot have been mortaring you cannot have been mortaring they cannot have been mortaring
Interrogative form
Simple form
can I mortar? can you mortar? can he mortar? can we mortar? can you mortar? can they mortar?
V-ing form
can I be mortaring? can you be mortaring? can he be mortaring? can we be mortaring? can you be mortaring? can they be mortaring?
Perfect
can I have mortared? can you have mortared? can he have mortared? can we have mortared? can you have mortared? can they have mortared?
V-ing perfect
can I have been mortaring? can you have been mortaring? can he have been mortaring? can we have been mortaring? can you have been mortaring? can they have been mortaring?
Interro-negative form
Simple form
can I not mortar? can you not mortar? can he not mortar? can we not mortar? can you not mortar? can they not mortar?
V-ing form
can I not be mortaring? can you not be mortaring? can he not be mortaring? can we not be mortaring? can you not be mortaring? can they not be mortaring?
Perfect
can I not have mortared? can you not have mortared? can he not have mortared? can we not have mortared? can you not have mortared? can they not have mortared?
V-ing perfect
can I not have been mortaring? can you not have been mortaring? can he not have been mortaring? can we not have been mortaring? can you not have been mortaring? can they not have been mortaring?