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 cannot invest you cannot invest she cannot invest we cannot invest you cannot invest they cannot invest	I cannot be investing you cannot be investing she cannot be investing we cannot be investing you cannot be investing they cannot be investing
Perfect	V-ing perfect
I cannot have invested you cannot have invested she cannot have invested we cannot have invested you cannot have invested they cannot have invested	I cannot have been investing you cannot have been investing she cannot have been investing we cannot have been investing you cannot have been investing they cannot 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 I not invest? can you not invest? can she not invest? can we not invest? can you not invest? can they not invest?	can I not be investing? can you not be investing? can she not be investing? can we not be investing? can you not be investing? can they not be investing?
Perfect	V-ing perfect
can I not have invested? can you not have invested? can she not have invested? can we not have invested? can you not have invested? can they not have invested?	can I not have been investing? can you not have been investing? can she not have been investing? can we not have been investing? can you not have been investing? can they not have been investing?