I could type you could type she could type we could type you could type they could type
V-ing form
I could be typing you could be typing she could be typing we could be typing you could be typing they could be typing
Perfect
I could have typed you could have typed she could have typed we could have typed you could have typed they could have typed
V-ing perfect
I could have been typing you could have been typing she could have been typing we could have been typing you could have been typing they could have been typing
Negation
Simple form
I could not type you could not type she could not type we could not type you could not type they could not type
V-ing form
I could not be typing you could not be typing she could not be typing we could not be typing you could not be typing they could not be typing
Perfect
I could not have typed you could not have typed she could not have typed we could not have typed you could not have typed they could not have typed
V-ing perfect
I could not have been typing you could not have been typing she could not have been typing we could not have been typing you could not have been typing they could not have been typing
Interrogative form
Simple form
could I type? could you type? could she type? could we type? could you type? could they type?
V-ing form
could I be typing? could you be typing? could she be typing? could we be typing? could you be typing? could they be typing?
Perfect
could I have typed? could you have typed? could she have typed? could we have typed? could you have typed? could they have typed?
V-ing perfect
could I have been typing? could you have been typing? could she have been typing? could we have been typing? could you have been typing? could they have been typing?
Interro-negative form
Simple form
could I not type? could you not type? could she not type? could we not type? could you not type? could they not type?
V-ing form
could I not be typing? could you not be typing? could she not be typing? could we not be typing? could you not be typing? could they not be typing?
Perfect
could I not have typed? could you not have typed? could she not have typed? could we not have typed? could you not have typed? could they not have typed?
V-ing perfect
could I not have been typing? could you not have been typing? could she not have been typing? could we not have been typing? could you not have been typing? could they not have been typing?