Conjugación del verbo inglés
COULD TREPHINE

Verbo regular: trephine - trephined - trephined

Afirmación

Forma simple	Forma con V-ing
I could trephine you could trephine he could trephine we could trephine you could trephine they could trephine	I could be trephining you could be trephining he could be trephining we could be trephining you could be trephining they could be trephining
Perfecto	Perfecto con V-ing
I could have trephined you could have trephined he could have trephined we could have trephined you could have trephined they could have trephined	I could have been trephining you could have been trephining he could have been trephining we could have been trephining you could have been trephining they could have been trephining

Negación

Forma simple	Forma con V-ing
I couldn't trephine you couldn't trephine he couldn't trephine we couldn't trephine you couldn't trephine they couldn't trephine	I couldn't be trephining you couldn't be trephining he couldn't be trephining we couldn't be trephining you couldn't be trephining they couldn't be trephining
Perfecto	Perfecto con V-ing
I couldn't have trephined you couldn't have trephined he couldn't have trephined we couldn't have trephined you couldn't have trephined they couldn't have trephined	I couldn't have been trephining you couldn't have been trephining he couldn't have been trephining we couldn't have been trephining you couldn't have been trephining they couldn't have been trephining

Forma interrogativa

Forma simple	Forma con V-ing
could I trephine? could you trephine? could he trephine? could we trephine? could you trephine? could they trephine?	could I be trephining? could you be trephining? could he be trephining? could we be trephining? could you be trephining? could they be trephining?
Perfecto	Perfecto con V-ing
could I have trephined? could you have trephined? could he have trephined? could we have trephined? could you have trephined? could they have trephined?	could I have been trephining? could you have been trephining? could he have been trephining? could we have been trephining? could you have been trephining? could they have been trephining?

Forma interro-negativa

Forma simple	Forma con V-ing
couldn't I trephine? couldn't you trephine? couldn't he trephine? couldn't we trephine? couldn't you trephine? couldn't they trephine?	couldn't I be trephining? couldn't you be trephining? couldn't he be trephining? couldn't we be trephining? couldn't you be trephining? couldn't they be trephining?
Perfecto	Perfecto con V-ing
couldn't I have trephined? couldn't you have trephined? couldn't he have trephined? couldn't we have trephined? couldn't you have trephined? couldn't they have trephined?	couldn't I have been trephining? couldn't you have been trephining? couldn't he have been trephining? couldn't we have been trephining? couldn't you have been trephining? couldn't they have been trephining?