English verb conjugation
COULD DROP

Regular verb: drop - dropped - dropped

Affirmation

Simple form	V-ing form
I could drop you could drop he could drop we could drop you could drop they could drop	I could be dropping you could be dropping he could be dropping we could be dropping you could be dropping they could be dropping
Perfect	V-ing perfect
I could have dropped you could have dropped he could have dropped we could have dropped you could have dropped they could have dropped	I could have been dropping you could have been dropping he could have been dropping we could have been dropping you could have been dropping they could have been dropping

Negation

Simple form	V-ing form
I could not drop you could not drop he could not drop we could not drop you could not drop they could not drop	I could not be dropping you could not be dropping he could not be dropping we could not be dropping you could not be dropping they could not be dropping
Perfect	V-ing perfect
I could not have dropped you could not have dropped he could not have dropped we could not have dropped you could not have dropped they could not have dropped	I could not have been dropping you could not have been dropping he could not have been dropping we could not have been dropping you could not have been dropping they could not have been dropping

Interrogative form

Simple form	V-ing form
could I drop? could you drop? could he drop? could we drop? could you drop? could they drop?	could I be dropping? could you be dropping? could he be dropping? could we be dropping? could you be dropping? could they be dropping?
Perfect	V-ing perfect
could I have dropped? could you have dropped? could he have dropped? could we have dropped? could you have dropped? could they have dropped?	could I have been dropping? could you have been dropping? could he have been dropping? could we have been dropping? could you have been dropping? could they have been dropping?

Interro-negative form

Simple form	V-ing form
could I not drop? could you not drop? could he not drop? could we not drop? could you not drop? could they not drop?	could I not be dropping? could you not be dropping? could he not be dropping? could we not be dropping? could you not be dropping? could they not be dropping?
Perfect	V-ing perfect
could I not have dropped? could you not have dropped? could he not have dropped? could we not have dropped? could you not have dropped? could they not have dropped?	could I not have been dropping? could you not have been dropping? could he not have been dropping? could we not have been dropping? could you not have been dropping? could they not have been dropping?