English verb conjugation
COULD AMASS

Regular verb: amass - amassed - amassed

Affirmation

Simple form	V-ing form
I could amass you could amass she could amass we could amass you could amass they could amass	I could be amassing you could be amassing she could be amassing we could be amassing you could be amassing they could be amassing
Perfect	V-ing perfect
I could have amassed you could have amassed she could have amassed we could have amassed you could have amassed they could have amassed	I could have been amassing you could have been amassing she could have been amassing we could have been amassing you could have been amassing they could have been amassing

Negation

Simple form	V-ing form
I could not amass you could not amass she could not amass we could not amass you could not amass they could not amass	I could not be amassing you could not be amassing she could not be amassing we could not be amassing you could not be amassing they could not be amassing
Perfect	V-ing perfect
I could not have amassed you could not have amassed she could not have amassed we could not have amassed you could not have amassed they could not have amassed	I could not have been amassing you could not have been amassing she could not have been amassing we could not have been amassing you could not have been amassing they could not have been amassing

Interrogative form

Simple form	V-ing form
could I amass? could you amass? could she amass? could we amass? could you amass? could they amass?	could I be amassing? could you be amassing? could she be amassing? could we be amassing? could you be amassing? could they be amassing?
Perfect	V-ing perfect
could I have amassed? could you have amassed? could she have amassed? could we have amassed? could you have amassed? could they have amassed?	could I have been amassing? could you have been amassing? could she have been amassing? could we have been amassing? could you have been amassing? could they have been amassing?

Interro-negative form

Simple form	V-ing form
could I not amass? could you not amass? could she not amass? could we not amass? could you not amass? could they not amass?	could I not be amassing? could you not be amassing? could she not be amassing? could we not be amassing? could you not be amassing? could they not be amassing?
Perfect	V-ing perfect
could I not have amassed? could you not have amassed? could she not have amassed? could we not have amassed? could you not have amassed? could they not have amassed?	could I not have been amassing? could you not have been amassing? could she not have been amassing? could we not have been amassing? could you not have been amassing? could they not have been amassing?