English verb conjugation
COULD INVEST

Regular verb: invest - invested - invested

Affirmation

Simple form	V-ing form
I could invest you could invest he could invest we could invest you could invest they could invest	I could be investing you could be investing he could be investing we could be investing you could be investing they could be investing
Perfect	V-ing perfect
I could have invested you could have invested he could have invested we could have invested you could have invested they could have invested	I could have been investing you could have been investing he could have been investing we could have been investing you could have been investing they could have been investing

Negation

Simple form	V-ing form
I couldn't invest you couldn't invest he couldn't invest we couldn't invest you couldn't invest they couldn't invest	I couldn't be investing you couldn't be investing he couldn't be investing we couldn't be investing you couldn't be investing they couldn't be investing
Perfect	V-ing perfect
I couldn't have invested you couldn't have invested he couldn't have invested we couldn't have invested you couldn't have invested they couldn't have invested	I couldn't have been investing you couldn't have been investing he couldn't have been investing we couldn't have been investing you couldn't have been investing they couldn't have been investing

Interrogative form

Simple form	V-ing form
could I invest? could you invest? could he invest? could we invest? could you invest? could they invest?	could I be investing? could you be investing? could he be investing? could we be investing? could you be investing? could they be investing?
Perfect	V-ing perfect
could I have invested? could you have invested? could he have invested? could we have invested? could you have invested? could they have invested?	could I have been investing? could you have been investing? could he have been investing? could we have been investing? could you have been investing? could they have been investing?

Interro-negative form

Simple form	V-ing form
couldn't I invest? couldn't you invest? couldn't he invest? couldn't we invest? couldn't you invest? couldn't they invest?	couldn't I be investing? couldn't you be investing? couldn't he be investing? couldn't we be investing? couldn't you be investing? couldn't they be investing?
Perfect	V-ing perfect
couldn't I have invested? couldn't you have invested? couldn't he have invested? couldn't we have invested? couldn't you have invested? couldn't they have invested?	couldn't I have been investing? couldn't you have been investing? couldn't he have been investing? couldn't we have been investing? couldn't you have been investing? couldn't they have been investing?