I could tweak you could tweak he could tweak we could tweak you could tweak they could tweak
Forma con V-ing
I could be tweaking you could be tweaking he could be tweaking we could be tweaking you could be tweaking they could be tweaking
Perfecto
I could have tweaked you could have tweaked he could have tweaked we could have tweaked you could have tweaked they could have tweaked
Perfecto con V-ing
I could have been tweaking you could have been tweaking he could have been tweaking we could have been tweaking you could have been tweaking they could have been tweaking
Negación
Forma simple
I couldn't tweak you couldn't tweak he couldn't tweak we couldn't tweak you couldn't tweak they couldn't tweak
Forma con V-ing
I couldn't be tweaking you couldn't be tweaking he couldn't be tweaking we couldn't be tweaking you couldn't be tweaking they couldn't be tweaking
Perfecto
I couldn't have tweaked you couldn't have tweaked he couldn't have tweaked we couldn't have tweaked you couldn't have tweaked they couldn't have tweaked
Perfecto con V-ing
I couldn't have been tweaking you couldn't have been tweaking he couldn't have been tweaking we couldn't have been tweaking you couldn't have been tweaking they couldn't have been tweaking
Forma interrogativa
Forma simple
could I tweak? could you tweak? could he tweak? could we tweak? could you tweak? could they tweak?
Forma con V-ing
could I be tweaking? could you be tweaking? could he be tweaking? could we be tweaking? could you be tweaking? could they be tweaking?
Perfecto
could I have tweaked? could you have tweaked? could he have tweaked? could we have tweaked? could you have tweaked? could they have tweaked?
Perfecto con V-ing
could I have been tweaking? could you have been tweaking? could he have been tweaking? could we have been tweaking? could you have been tweaking? could they have been tweaking?
Forma interro-negativa
Forma simple
couldn't I tweak? couldn't you tweak? couldn't he tweak? couldn't we tweak? couldn't you tweak? couldn't they tweak?
Forma con V-ing
couldn't I be tweaking? couldn't you be tweaking? couldn't he be tweaking? couldn't we be tweaking? couldn't you be tweaking? couldn't they be tweaking?
Perfecto
couldn't I have tweaked? couldn't you have tweaked? couldn't he have tweaked? couldn't we have tweaked? couldn't you have tweaked? couldn't they have tweaked?
Perfecto con V-ing
couldn't I have been tweaking? couldn't you have been tweaking? couldn't he have been tweaking? couldn't we have been tweaking? couldn't you have been tweaking? couldn't they have been tweaking?