English verb conjugation
CAN INVEST

Regular verb: invest - invested - invested

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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