English verb conjugation
COULD BOAT

Regular verb: boat - boated - boated

Affirmation

Simple form	V-ing form
I could boat you could boat he could boat we could boat you could boat they could boat	I could be boating you could be boating he could be boating we could be boating you could be boating they could be boating
Perfect	V-ing perfect
I could have boated you could have boated he could have boated we could have boated you could have boated they could have boated	I could have been boating you could have been boating he could have been boating we could have been boating you could have been boating they could have been boating

Negation

Simple form	V-ing form
I could not boat you could not boat he could not boat we could not boat you could not boat they could not boat	I could not be boating you could not be boating he could not be boating we could not be boating you could not be boating they could not be boating
Perfect	V-ing perfect
I could not have boated you could not have boated he could not have boated we could not have boated you could not have boated they could not have boated	I could not have been boating you could not have been boating he could not have been boating we could not have been boating you could not have been boating they could not have been boating

Interrogative form

Simple form	V-ing form
could I boat? could you boat? could he boat? could we boat? could you boat? could they boat?	could I be boating? could you be boating? could he be boating? could we be boating? could you be boating? could they be boating?
Perfect	V-ing perfect
could I have boated? could you have boated? could he have boated? could we have boated? could you have boated? could they have boated?	could I have been boating? could you have been boating? could he have been boating? could we have been boating? could you have been boating? could they have been boating?

Interro-negative form

Simple form	V-ing form
could I not boat? could you not boat? could he not boat? could we not boat? could you not boat? could they not boat?	could I not be boating? could you not be boating? could he not be boating? could we not be boating? could you not be boating? could they not be boating?
Perfect	V-ing perfect
could I not have boated? could you not have boated? could he not have boated? could we not have boated? could you not have boated? could they not have boated?	could I not have been boating? could you not have been boating? could he not have been boating? could we not have been boating? could you not have been boating? could they not have been boating?