English verb conjugation
CAN IMPROVE

Regular verb: improve - improved - improved

Affirmation

Simple form	V-ing form
I can improve you can improve he can improve we can improve you can improve they can improve	I can be improving you can be improving he can be improving we can be improving you can be improving they can be improving
Perfect	V-ing perfect
I can have improved you can have improved he can have improved we can have improved you can have improved they can have improved	I can have been improving you can have been improving he can have been improving we can have been improving you can have been improving they can have been improving

Negation

Simple form	V-ing form
I can't improve you can't improve he can't improve we can't improve you can't improve they can't improve	I can't be improving you can't be improving he can't be improving we can't be improving you can't be improving they can't be improving
Perfect	V-ing perfect
I can't have improved you can't have improved he can't have improved we can't have improved you can't have improved they can't have improved	I can't have been improving you can't have been improving he can't have been improving we can't have been improving you can't have been improving they can't have been improving

Interrogative form

Simple form	V-ing form
can I improve? can you improve? can he improve? can we improve? can you improve? can they improve?	can I be improving? can you be improving? can he be improving? can we be improving? can you be improving? can they be improving?
Perfect	V-ing perfect
can I have improved? can you have improved? can he have improved? can we have improved? can you have improved? can they have improved?	can I have been improving? can you have been improving? can he have been improving? can we have been improving? can you have been improving? can they have been improving?

Interro-negative form

Simple form	V-ing form
can't I improve? can't you improve? can't he improve? can't we improve? can't you improve? can't they improve?	can't I be improving? can't you be improving? can't he be improving? can't we be improving? can't you be improving? can't they be improving?
Perfect	V-ing perfect
can't I have improved? can't you have improved? can't he have improved? can't we have improved? can't you have improved? can't they have improved?	can't I have been improving? can't you have been improving? can't he have been improving? can't we have been improving? can't you have been improving? can't they have been improving?