I could toast you could toast she could toast we could toast you could toast they could toast
V-ing form
I could be toasting you could be toasting she could be toasting we could be toasting you could be toasting they could be toasting
Perfect
I could have toasted you could have toasted she could have toasted we could have toasted you could have toasted they could have toasted
V-ing perfect
I could have been toasting you could have been toasting she could have been toasting we could have been toasting you could have been toasting they could have been toasting
Negation
Simple form
I couldn't toast you couldn't toast she couldn't toast we couldn't toast you couldn't toast they couldn't toast
V-ing form
I couldn't be toasting you couldn't be toasting she couldn't be toasting we couldn't be toasting you couldn't be toasting they couldn't be toasting
Perfect
I couldn't have toasted you couldn't have toasted she couldn't have toasted we couldn't have toasted you couldn't have toasted they couldn't have toasted
V-ing perfect
I couldn't have been toasting you couldn't have been toasting she couldn't have been toasting we couldn't have been toasting you couldn't have been toasting they couldn't have been toasting
Interrogative form
Simple form
could I toast? could you toast? could she toast? could we toast? could you toast? could they toast?
V-ing form
could I be toasting? could you be toasting? could she be toasting? could we be toasting? could you be toasting? could they be toasting?
Perfect
could I have toasted? could you have toasted? could she have toasted? could we have toasted? could you have toasted? could they have toasted?
V-ing perfect
could I have been toasting? could you have been toasting? could she have been toasting? could we have been toasting? could you have been toasting? could they have been toasting?
Interro-negative form
Simple form
couldn't I toast? couldn't you toast? couldn't she toast? couldn't we toast? couldn't you toast? couldn't they toast?
V-ing form
couldn't I be toasting? couldn't you be toasting? couldn't she be toasting? couldn't we be toasting? couldn't you be toasting? couldn't they be toasting?
Perfect
couldn't I have toasted? couldn't you have toasted? couldn't she have toasted? couldn't we have toasted? couldn't you have toasted? couldn't they have toasted?
V-ing perfect
couldn't I have been toasting? couldn't you have been toasting? couldn't she have been toasting? couldn't we have been toasting? couldn't you have been toasting? couldn't they have been toasting?