English verb conjugation
COULD SWIM

Irregular verb: swim - swam - swum

Affirmation

Simple form	V-ing form
I could swim you could swim he could swim we could swim you could swim they could swim	I could be swimming you could be swimming he could be swimming we could be swimming you could be swimming they could be swimming
Perfect	V-ing perfect
I could have swum you could have swum he could have swum we could have swum you could have swum they could have swum	I could have been swimming you could have been swimming he could have been swimming we could have been swimming you could have been swimming they could have been swimming

Negation

Simple form	V-ing form
I couldn't swim you couldn't swim he couldn't swim we couldn't swim you couldn't swim they couldn't swim	I couldn't be swimming you couldn't be swimming he couldn't be swimming we couldn't be swimming you couldn't be swimming they couldn't be swimming
Perfect	V-ing perfect
I couldn't have swum you couldn't have swum he couldn't have swum we couldn't have swum you couldn't have swum they couldn't have swum	I couldn't have been swimming you couldn't have been swimming he couldn't have been swimming we couldn't have been swimming you couldn't have been swimming they couldn't have been swimming

Interrogative form

Simple form	V-ing form
could I swim? could you swim? could he swim? could we swim? could you swim? could they swim?	could I be swimming? could you be swimming? could he be swimming? could we be swimming? could you be swimming? could they be swimming?
Perfect	V-ing perfect
could I have swum? could you have swum? could he have swum? could we have swum? could you have swum? could they have swum?	could I have been swimming? could you have been swimming? could he have been swimming? could we have been swimming? could you have been swimming? could they have been swimming?

Interro-negative form

Simple form	V-ing form
couldn't I swim? couldn't you swim? couldn't he swim? couldn't we swim? couldn't you swim? couldn't they swim?	couldn't I be swimming? couldn't you be swimming? couldn't he be swimming? couldn't we be swimming? couldn't you be swimming? couldn't they be swimming?
Perfect	V-ing perfect
couldn't I have swum? couldn't you have swum? couldn't he have swum? couldn't we have swum? couldn't you have swum? couldn't they have swum?	couldn't I have been swimming? couldn't you have been swimming? couldn't he have been swimming? couldn't we have been swimming? couldn't you have been swimming? couldn't they have been swimming?