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 couldn't boat you couldn't boat he couldn't boat we couldn't boat you couldn't boat they couldn't boat	I couldn't be boating you couldn't be boating he couldn't be boating we couldn't be boating you couldn't be boating they couldn't be boating
Perfect	V-ing perfect
I couldn't have boated you couldn't have boated he couldn't have boated we couldn't have boated you couldn't have boated they couldn't have boated	I couldn't have been boating you couldn't have been boating he couldn't have been boating we couldn't have been boating you couldn't have been boating they couldn't 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
couldn't I boat? couldn't you boat? couldn't he boat? couldn't we boat? couldn't you boat? couldn't they boat?	couldn't I be boating? couldn't you be boating? couldn't he be boating? couldn't we be boating? couldn't you be boating? couldn't they be boating?
Perfect	V-ing perfect
couldn't I have boated? couldn't you have boated? couldn't he have boated? couldn't we have boated? couldn't you have boated? couldn't they have boated?	couldn't I have been boating? couldn't you have been boating? couldn't he have been boating? couldn't we have been boating? couldn't you have been boating? couldn't they have been boating?