can collaborate
Regular verb: collaborate - collaborated- collaborated

Affirmation 	
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I can collaborate
you can collaborate
he can collaborate
we can collaborate
you can collaborate
they can collaborate 	I can be collaborating
you can be collaborating
he can be collaborating
we can be collaborating
you can be collaborating
they can be collaborating	I can have collaborated
you can have collaborated
he can have collaborated
we can have collaborated
you can have collaborated
they can have collaborated	I can have been collaborating
you can have been collaborating
he can have been collaborating
we can have been collaborating
you can have been collaborating
they can have been collaborating	

Negation 	
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I cannot collaborate
you cannot collaborate
he cannot collaborate
we cannot collaborate
you cannot collaborate
they cannot collaborate 	I cannot be collaborating
you cannot be collaborating
he cannot be collaborating
we cannot be collaborating
you cannot be collaborating
they cannot be collaborating	I cannot have collaborated
you cannot have collaborated
he cannot have collaborated
we cannot have collaborated
you cannot have collaborated
they cannot have collaborated	I cannot have been collaborating
you cannot have been collaborating
he cannot have been collaborating
we cannot have been collaborating
you cannot have been collaborating
they cannot have been collaborating	

Interrogative form 	
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can I collaborate?
can you collaborate?
can he collaborate?
can we collaborate?
can you collaborate?
can they collaborate? 	can I be collaborating?
can you be collaborating?
can he be collaborating?
can we be collaborating?
can you be collaborating?
can they be collaborating? 	can I have collaborated?
can you have collaborated?
can he have collaborated?
can we have collaborated?
can you have collaborated?
can they have collaborated? 	can I have been collaborating?
can you have been collaborating?
can he have been collaborating?
can we have been collaborating?
can you have been collaborating?
can they have been collaborating? 	

Interro-negative form 	
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can I not collaborate?
can you not collaborate?
can he not collaborate?
can we not collaborate?
can you not collaborate?
can they not collaborate? 	can I not be collaborating?
can you not be collaborating?
can he not be collaborating?
can we not be collaborating?
can you not be collaborating?
can they not be collaborating? 	can I not have collaborated?
can you not have collaborated?
can he not have collaborated?
can we not have collaborated?
can you not have collaborated?
can they not have collaborated? 	can I not have been collaborating?
can you not have been collaborating?
can he not have been collaborating?
can we not have been collaborating?
can you not have been collaborating?
can they not have been collaborating?