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 couldn't type you couldn't type she couldn't type we couldn't type you couldn't type they couldn't type
V-ing form
I couldn't be typing you couldn't be typing she couldn't be typing we couldn't be typing you couldn't be typing they couldn't be typing
Perfect
I couldn't have typed you couldn't have typed she couldn't have typed we couldn't have typed you couldn't have typed they couldn't have typed
V-ing perfect
I couldn't have been typing you couldn't have been typing she couldn't have been typing we couldn't have been typing you couldn't have been typing they couldn't 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
couldn't I type? couldn't you type? couldn't she type? couldn't we type? couldn't you type? couldn't they type?
V-ing form
couldn't I be typing? couldn't you be typing? couldn't she be typing? couldn't we be typing? couldn't you be typing? couldn't they be typing?
Perfect
couldn't I have typed? couldn't you have typed? couldn't she have typed? couldn't we have typed? couldn't you have typed? couldn't they have typed?
V-ing perfect
couldn't I have been typing? couldn't you have been typing? couldn't she have been typing? couldn't we have been typing? couldn't you have been typing? couldn't they have been typing?