English verb conjugation
COULD THUD

Regular verb: thud - thudded - thudded

Affirmation

Simple form	V-ing form
I could thud you could thud she could thud we could thud you could thud they could thud	I could be thudding you could be thudding she could be thudding we could be thudding you could be thudding they could be thudding
Perfect	V-ing perfect
I could have thudded you could have thudded she could have thudded we could have thudded you could have thudded they could have thudded	I could have been thudding you could have been thudding she could have been thudding we could have been thudding you could have been thudding they could have been thudding

Negation

Simple form	V-ing form
I could not thud you could not thud she could not thud we could not thud you could not thud they could not thud	I could not be thudding you could not be thudding she could not be thudding we could not be thudding you could not be thudding they could not be thudding
Perfect	V-ing perfect
I could not have thudded you could not have thudded she could not have thudded we could not have thudded you could not have thudded they could not have thudded	I could not have been thudding you could not have been thudding she could not have been thudding we could not have been thudding you could not have been thudding they could not have been thudding

Interrogative form

Simple form	V-ing form
could I thud? could you thud? could she thud? could we thud? could you thud? could they thud?	could I be thudding? could you be thudding? could she be thudding? could we be thudding? could you be thudding? could they be thudding?
Perfect	V-ing perfect
could I have thudded? could you have thudded? could she have thudded? could we have thudded? could you have thudded? could they have thudded?	could I have been thudding? could you have been thudding? could she have been thudding? could we have been thudding? could you have been thudding? could they have been thudding?

Interro-negative form

Simple form	V-ing form
could I not thud? could you not thud? could she not thud? could we not thud? could you not thud? could they not thud?	could I not be thudding? could you not be thudding? could she not be thudding? could we not be thudding? could you not be thudding? could they not be thudding?
Perfect	V-ing perfect
could I not have thudded? could you not have thudded? could she not have thudded? could we not have thudded? could you not have thudded? could they not have thudded?	could I not have been thudding? could you not have been thudding? could she not have been thudding? could we not have been thudding? could you not have been thudding? could they not have been thudding?