can estimate
Regular verb: estimate - estimated- estimated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can estimate
you can estimate
he can estimate
we can estimate
you can estimate
they can estimate 	I can be estimating
you can be estimating
he can be estimating
we can be estimating
you can be estimating
they can be estimating	I can have estimated
you can have estimated
he 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
he 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 can't estimate
you can't estimate
he can't estimate
we can't estimate
you can't estimate
they can't estimate 	I can't be estimating
you can't be estimating
he can't be estimating
we can't be estimating
you can't be estimating
they can't be estimating	I can't have estimated
you can't have estimated
he can't have estimated
we can't have estimated
you can't have estimated
they can't have estimated	I can't have been estimating
you can't have been estimating
he can't have been estimating
we can't have been estimating
you can't have been estimating
they can't have been estimating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I estimate?
can you estimate?
can he estimate?
can we estimate?
can you estimate?
can they estimate? 	can I be estimating?
can you be estimating?
can he be estimating?
can we be estimating?
can you be estimating?
can they be estimating? 	can I have estimated?
can you have estimated?
can he 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 he 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't I estimate?
can't you estimate?
can't he estimate?
can't we estimate?
can't you estimate?
can't they estimate? 	can't I be estimating?
can't you be estimating?
can't he be estimating?
can't we be estimating?
can't you be estimating?
can't they be estimating? 	can't I have estimated?
can't you have estimated?
can't he have estimated?
can't we have estimated?
can't you have estimated?
can't they have estimated? 	can't I have been estimating?
can't you have been estimating?
can't he have been estimating?
can't we have been estimating?
can't you have been estimating?
can't they have been estimating?