Conjugação do verbo inglês
COULD RESEARCH

Verbo regular: research - researched - researched

Afirmação

Forma simple	Forma com V-ing
I could research you could research he could research we could research you could research they could research	I could be researching you could be researching he could be researching we could be researching you could be researching they could be researching
Perfeito	Perfeito com V-ing
I could have researched you could have researched he could have researched we could have researched you could have researched they could have researched	I could have been researching you could have been researching he could have been researching we could have been researching you could have been researching they could have been researching

Negação

Forma simple	Forma com V-ing
I couldn't research you couldn't research he couldn't research we couldn't research you couldn't research they couldn't research	I couldn't be researching you couldn't be researching he couldn't be researching we couldn't be researching you couldn't be researching they couldn't be researching
Perfeito	Perfeito com V-ing
I couldn't have researched you couldn't have researched he couldn't have researched we couldn't have researched you couldn't have researched they couldn't have researched	I couldn't have been researching you couldn't have been researching he couldn't have been researching we couldn't have been researching you couldn't have been researching they couldn't have been researching

Forma interrogativa

Forma simple	Forma com V-ing
could I research? could you research? could he research? could we research? could you research? could they research?	could I be researching? could you be researching? could he be researching? could we be researching? could you be researching? could they be researching?
Perfeito	Perfeito com V-ing
could I have researched? could you have researched? could he have researched? could we have researched? could you have researched? could they have researched?	could I have been researching? could you have been researching? could he have been researching? could we have been researching? could you have been researching? could they have been researching?

Forma interro-Negação

Forma simple	Forma com V-ing
couldn't I research? couldn't you research? couldn't he research? couldn't we research? couldn't you research? couldn't they research?	couldn't I be researching? couldn't you be researching? couldn't he be researching? couldn't we be researching? couldn't you be researching? couldn't they be researching?
Perfeito	Perfeito com V-ing
couldn't I have researched? couldn't you have researched? couldn't he have researched? couldn't we have researched? couldn't you have researched? couldn't they have researched?	couldn't I have been researching? couldn't you have been researching? couldn't he have been researching? couldn't we have been researching? couldn't you have been researching? couldn't they have been researching?