could shake
Irregular verb: shake - shook- shaken

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could shake
you could shake
he could shake
we could shake
you could shake
they could shake 	I could be shaking
you could be shaking
he could be shaking
we could be shaking
you could be shaking
they could be shaking	I could have shaken
you could have shaken
he 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
he 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 could not shake
you could not shake
he could not shake
we could not shake
you could not shake
they could not shake 	I could not be shaking
you could not be shaking
he could not be shaking
we could not be shaking
you could not be shaking
they could not be shaking	I could not have shaken
you could not have shaken
he could not have shaken
we could not have shaken
you could not have shaken
they could not have shaken	I could not have been shaking
you could not have been shaking
he could not have been shaking
we could not have been shaking
you could not have been shaking
they could not have been shaking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I shake?
could you shake?
could he shake?
could we shake?
could you shake?
could they shake? 	could I be shaking?
could you be shaking?
could he be shaking?
could we be shaking?
could you be shaking?
could they be shaking? 	could I have shaken?
could you have shaken?
could he 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 he 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 	
could I not shake?
could you not shake?
could he not shake?
could we not shake?
could you not shake?
could they not shake? 	could I not be shaking?
could you not be shaking?
could he not be shaking?
could we not be shaking?
could you not be shaking?
could they not be shaking? 	could I not have shaken?
could you not have shaken?
could he not have shaken?
could we not have shaken?
could you not have shaken?
could they not have shaken? 	could I not have been shaking?
could you not have been shaking?
could he not have been shaking?
could we not have been shaking?
could you not have been shaking?
could they not have been shaking?