English verb conjugation
COULD JAPAN

Regular verb: japan - japaned - japaned

Affirmation

Simple form	V-ing form
I could japan you could japan he could japan we could japan you could japan they could japan	I could be japaning you could be japaning he could be japaning we could be japaning you could be japaning they could be japaning
Perfect	V-ing perfect
I could have japaned you could have japaned he could have japaned we could have japaned you could have japaned they could have japaned	I could have been japaning you could have been japaning he could have been japaning we could have been japaning you could have been japaning they could have been japaning

Negation

Simple form	V-ing form
I couldn't japan you couldn't japan he couldn't japan we couldn't japan you couldn't japan they couldn't japan	I couldn't be japaning you couldn't be japaning he couldn't be japaning we couldn't be japaning you couldn't be japaning they couldn't be japaning
Perfect	V-ing perfect
I couldn't have japaned you couldn't have japaned he couldn't have japaned we couldn't have japaned you couldn't have japaned they couldn't have japaned	I couldn't have been japaning you couldn't have been japaning he couldn't have been japaning we couldn't have been japaning you couldn't have been japaning they couldn't have been japaning

Interrogative form

Simple form	V-ing form
could I japan? could you japan? could he japan? could we japan? could you japan? could they japan?	could I be japaning? could you be japaning? could he be japaning? could we be japaning? could you be japaning? could they be japaning?
Perfect	V-ing perfect
could I have japaned? could you have japaned? could he have japaned? could we have japaned? could you have japaned? could they have japaned?	could I have been japaning? could you have been japaning? could he have been japaning? could we have been japaning? could you have been japaning? could they have been japaning?

Interro-negative form

Simple form	V-ing form
couldn't I japan? couldn't you japan? couldn't he japan? couldn't we japan? couldn't you japan? couldn't they japan?	couldn't I be japaning? couldn't you be japaning? couldn't he be japaning? couldn't we be japaning? couldn't you be japaning? couldn't they be japaning?
Perfect	V-ing perfect
couldn't I have japaned? couldn't you have japaned? couldn't he have japaned? couldn't we have japaned? couldn't you have japaned? couldn't they have japaned?	couldn't I have been japaning? couldn't you have been japaning? couldn't he have been japaning? couldn't we have been japaning? couldn't you have been japaning? couldn't they have been japaning?