can tremble
Regular verb: tremble - trembled- trembled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can tremble
you can tremble
he can tremble
we can tremble
you can tremble
they can tremble 	I can be trembling
you can be trembling
he can be trembling
we can be trembling
you can be trembling
they can be trembling	I can have trembled
you can have trembled
he can have trembled
we can have trembled
you can have trembled
they can have trembled	I can have been trembling
you can have been trembling
he can have been trembling
we can have been trembling
you can have been trembling
they can have been trembling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't tremble
you can't tremble
he can't tremble
we can't tremble
you can't tremble
they can't tremble 	I can't be trembling
you can't be trembling
he can't be trembling
we can't be trembling
you can't be trembling
they can't be trembling	I can't have trembled
you can't have trembled
he can't have trembled
we can't have trembled
you can't have trembled
they can't have trembled	I can't have been trembling
you can't have been trembling
he can't have been trembling
we can't have been trembling
you can't have been trembling
they can't have been trembling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I tremble?
can you tremble?
can he tremble?
can we tremble?
can you tremble?
can they tremble? 	can I be trembling?
can you be trembling?
can he be trembling?
can we be trembling?
can you be trembling?
can they be trembling? 	can I have trembled?
can you have trembled?
can he have trembled?
can we have trembled?
can you have trembled?
can they have trembled? 	can I have been trembling?
can you have been trembling?
can he have been trembling?
can we have been trembling?
can you have been trembling?
can they have been trembling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I tremble?
can't you tremble?
can't he tremble?
can't we tremble?
can't you tremble?
can't they tremble? 	can't I be trembling?
can't you be trembling?
can't he be trembling?
can't we be trembling?
can't you be trembling?
can't they be trembling? 	can't I have trembled?
can't you have trembled?
can't he have trembled?
can't we have trembled?
can't you have trembled?
can't they have trembled? 	can't I have been trembling?
can't you have been trembling?
can't he have been trembling?
can't we have been trembling?
can't you have been trembling?
can't they have been trembling?