could embark
Regular verb: embark - embarked- embarked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could embark
you could embark
she could embark
we could embark
you could embark
they could embark 	I could be embarking
you could be embarking
she could be embarking
we could be embarking
you could be embarking
they could be embarking	I could have embarked
you could have embarked
she could have embarked
we could have embarked
you could have embarked
they could have embarked	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 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't embark
you couldn't embark
she couldn't embark
we couldn't embark
you couldn't embark
they couldn't embark 	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	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	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 	V-ing form 	Perfect 	V-ing perfect 	
could I embark?
could you embark?
could she embark?
could we embark?
could you embark?
could they embark? 	could I be embarking?
could you be embarking?
could she be embarking?
could we be embarking?
could you be embarking?
could they be embarking? 	could I have embarked?
could you have embarked?
could she have embarked?
could we have embarked?
could you have embarked?
could they have embarked? 	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 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I embark?
couldn't you embark?
couldn't she embark?
couldn't we embark?
couldn't you embark?
couldn't they embark? 	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? 	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? 	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?