could shake
Irregular verb: shake - shook- shaken

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could shake
you could shake
she could shake
we could shake
you could shake
they could shake 	I could be shaking
you could be shaking
she could be shaking
we could be shaking
you could be shaking
they could be shaking	I could have shaken
you could have shaken
she could have shaken
we could have shaken
you could have shaken
they could have shaken	I could have been shaking
you could have been shaking
she could have been shaking
we could have been shaking
you could have been shaking
they could have been shaking	

Negation 	
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I couldn't shake
you couldn't shake
she couldn't shake
we couldn't shake
you couldn't shake
they couldn't shake 	I couldn't be shaking
you couldn't be shaking
she couldn't be shaking
we couldn't be shaking
you couldn't be shaking
they couldn't be shaking	I couldn't have shaken
you couldn't have shaken
she couldn't have shaken
we couldn't have shaken
you couldn't have shaken
they couldn't have shaken	I couldn't have been shaking
you couldn't have been shaking
she couldn't have been shaking
we couldn't have been shaking
you couldn't have been shaking
they couldn't have been shaking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I shake?
could you shake?
could she shake?
could we shake?
could you shake?
could they shake? 	could I be shaking?
could you be shaking?
could she be shaking?
could we be shaking?
could you be shaking?
could they be shaking? 	could I have shaken?
could you have shaken?
could she have shaken?
could we have shaken?
could you have shaken?
could they have shaken? 	could I have been shaking?
could you have been shaking?
could she have been shaking?
could we have been shaking?
could you have been shaking?
could they have been shaking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I shake?
couldn't you shake?
couldn't she shake?
couldn't we shake?
couldn't you shake?
couldn't they shake? 	couldn't I be shaking?
couldn't you be shaking?
couldn't she be shaking?
couldn't we be shaking?
couldn't you be shaking?
couldn't they be shaking? 	couldn't I have shaken?
couldn't you have shaken?
couldn't she have shaken?
couldn't we have shaken?
couldn't you have shaken?
couldn't they have shaken? 	couldn't I have been shaking?
couldn't you have been shaking?
couldn't she have been shaking?
couldn't we have been shaking?
couldn't you have been shaking?
couldn't they have been shaking?