Conjugación del verbo inglés
COULD CHECK

Verbo regular: check - checked - checked

Afirmación

Forma simple	Forma con V-ing
I could check you could check he could check we could check you could check they could check	I could be checking you could be checking he could be checking we could be checking you could be checking they could be checking
Perfecto	Perfecto con V-ing
I could have checked you could have checked he could have checked we could have checked you could have checked they could have checked	I could have been checking you could have been checking he could have been checking we could have been checking you could have been checking they could have been checking

Negación

Forma simple	Forma con V-ing
I couldn't check you couldn't check he couldn't check we couldn't check you couldn't check they couldn't check	I couldn't be checking you couldn't be checking he couldn't be checking we couldn't be checking you couldn't be checking they couldn't be checking
Perfecto	Perfecto con V-ing
I couldn't have checked you couldn't have checked he couldn't have checked we couldn't have checked you couldn't have checked they couldn't have checked	I couldn't have been checking you couldn't have been checking he couldn't have been checking we couldn't have been checking you couldn't have been checking they couldn't have been checking

Forma interrogativa

Forma simple	Forma con V-ing
could I check? could you check? could he check? could we check? could you check? could they check?	could I be checking? could you be checking? could he be checking? could we be checking? could you be checking? could they be checking?
Perfecto	Perfecto con V-ing
could I have checked? could you have checked? could he have checked? could we have checked? could you have checked? could they have checked?	could I have been checking? could you have been checking? could he have been checking? could we have been checking? could you have been checking? could they have been checking?

Forma interro-negativa

Forma simple	Forma con V-ing
couldn't I check? couldn't you check? couldn't he check? couldn't we check? couldn't you check? couldn't they check?	couldn't I be checking? couldn't you be checking? couldn't he be checking? couldn't we be checking? couldn't you be checking? couldn't they be checking?
Perfecto	Perfecto con V-ing
couldn't I have checked? couldn't you have checked? couldn't he have checked? couldn't we have checked? couldn't you have checked? couldn't they have checked?	couldn't I have been checking? couldn't you have been checking? couldn't he have been checking? couldn't we have been checking? couldn't you have been checking? couldn't they have been checking?