can estimate
Regular verb: estimate - estimated- estimated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can estimate
you can estimate
she can estimate
we can estimate
you can estimate
they can estimate 	I can be estimating
you can be estimating
she can be estimating
we can be estimating
you can be estimating
they can be estimating	I can have estimated
you can have estimated
she can have estimated
we can have estimated
you can have estimated
they can have estimated	I can have been estimating
you can have been estimating
she can have been estimating
we can have been estimating
you can have been estimating
they can have been estimating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot estimate
you cannot estimate
she cannot estimate
we cannot estimate
you cannot estimate
they cannot estimate 	I cannot be estimating
you cannot be estimating
she cannot be estimating
we cannot be estimating
you cannot be estimating
they cannot be estimating	I cannot have estimated
you cannot have estimated
she cannot have estimated
we cannot have estimated
you cannot have estimated
they cannot have estimated	I cannot have been estimating
you cannot have been estimating
she cannot have been estimating
we cannot have been estimating
you cannot have been estimating
they cannot have been estimating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I estimate?
can you estimate?
can she estimate?
can we estimate?
can you estimate?
can they estimate? 	can I be estimating?
can you be estimating?
can she be estimating?
can we be estimating?
can you be estimating?
can they be estimating? 	can I have estimated?
can you have estimated?
can she have estimated?
can we have estimated?
can you have estimated?
can they have estimated? 	can I have been estimating?
can you have been estimating?
can she have been estimating?
can we have been estimating?
can you have been estimating?
can they have been estimating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not estimate?
can you not estimate?
can she not estimate?
can we not estimate?
can you not estimate?
can they not estimate? 	can I not be estimating?
can you not be estimating?
can she not be estimating?
can we not be estimating?
can you not be estimating?
can they not be estimating? 	can I not have estimated?
can you not have estimated?
can she not have estimated?
can we not have estimated?
can you not have estimated?
can they not have estimated? 	can I not have been estimating?
can you not have been estimating?
can she not have been estimating?
can we not have been estimating?
can you not have been estimating?
can they not have been estimating?