English verb conjugation
COULD INVEST

Regular verb: invest - invested - invested

Affirmation

Simple form	V-ing form
I could invest you could invest she could invest we could invest you could invest they could invest	I could be investing you could be investing she 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 she 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 she 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 she 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 she 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 she 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 she 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 she invest? could we invest? could you invest? could they invest?	could I be investing? could you be investing? could she 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 she 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 she 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 she 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 she 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 she 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 she have been investing? couldn't we have been investing? couldn't you have been investing? couldn't they have been investing?