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