could examine
Verbo regular: examine - examined- examined

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could examine
you could examine
he could examine
we could examine
you could examine
they could examine 	I could be examining
you could be examining
he could be examining
we could be examining
you could be examining
they could be examining	I could have examined
you could have examined
he could have examined
we could have examined
you could have examined
they could have examined	I could have been examining
you could have been examining
he could have been examining
we could have been examining
you could have been examining
they could have been examining	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't examine
you couldn't examine
he couldn't examine
we couldn't examine
you couldn't examine
they couldn't examine 	I couldn't be examining
you couldn't be examining
he couldn't be examining
we couldn't be examining
you couldn't be examining
they couldn't be examining	I couldn't have examined
you couldn't have examined
he couldn't have examined
we couldn't have examined
you couldn't have examined
they couldn't have examined	I couldn't have been examining
you couldn't have been examining
he couldn't have been examining
we couldn't have been examining
you couldn't have been examining
they couldn't have been examining	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I examine?
could you examine?
could he examine?
could we examine?
could you examine?
could they examine? 	could I be examining?
could you be examining?
could he be examining?
could we be examining?
could you be examining?
could they be examining? 	could I have examined?
could you have examined?
could he have examined?
could we have examined?
could you have examined?
could they have examined? 	could I have been examining?
could you have been examining?
could he have been examining?
could we have been examining?
could you have been examining?
could they have been examining? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I examine?
couldn't you examine?
couldn't he examine?
couldn't we examine?
couldn't you examine?
couldn't they examine? 	couldn't I be examining?
couldn't you be examining?
couldn't he be examining?
couldn't we be examining?
couldn't you be examining?
couldn't they be examining? 	couldn't I have examined?
couldn't you have examined?
couldn't he have examined?
couldn't we have examined?
couldn't you have examined?
couldn't they have examined? 	couldn't I have been examining?
couldn't you have been examining?
couldn't he have been examining?
couldn't we have been examining?
couldn't you have been examining?
couldn't they have been examining?