I could embark you could embark he could embark we could embark you could embark they could embark
V-ing form
I could be embarking you could be embarking he could be embarking we could be embarking you could be embarking they could be embarking
Perfect
I could have embarked you could have embarked he 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 he could have been embarking we could have been embarking you could have been embarking they could have been embarking
Negation
Simple form
I could not embark you could not embark he could not embark we could not embark you could not embark they could not embark
V-ing form
I could not be embarking you could not be embarking he could not be embarking we could not be embarking you could not be embarking they could not be embarking
Perfect
I could not have embarked you could not have embarked he could not have embarked we could not have embarked you could not have embarked they could not have embarked
V-ing perfect
I could not have been embarking you could not have been embarking he could not have been embarking we could not have been embarking you could not have been embarking they could not have been embarking
Interrogative form
Simple form
could I embark? could you embark? could he embark? could we embark? could you embark? could they embark?
V-ing form
could I be embarking? could you be embarking? could he be embarking? could we be embarking? could you be embarking? could they be embarking?
Perfect
could I have embarked? could you have embarked? could he 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 he have been embarking? could we have been embarking? could you have been embarking? could they have been embarking?
Interro-negative form
Simple form
could I not embark? could you not embark? could he not embark? could we not embark? could you not embark? could they not embark?
V-ing form
could I not be embarking? could you not be embarking? could he not be embarking? could we not be embarking? could you not be embarking? could they not be embarking?
Perfect
could I not have embarked? could you not have embarked? could he not have embarked? could we not have embarked? could you not have embarked? could they not have embarked?
V-ing perfect
could I not have been embarking? could you not have been embarking? could he not have been embarking? could we not have been embarking? could you not have been embarking? could they not have been embarking?