English verb conjugation
COULD TWITTER

Regular verb: twitter - twittered - twittered

Affirmation

Simple form	V-ing form
I could twitter you could twitter she could twitter we could twitter you could twitter they could twitter	I could be twittering you could be twittering she could be twittering we could be twittering you could be twittering they could be twittering
Perfect	V-ing perfect
I could have twittered you could have twittered she could have twittered we could have twittered you could have twittered they could have twittered	I could have been twittering you could have been twittering she could have been twittering we could have been twittering you could have been twittering they could have been twittering

Negation

Simple form	V-ing form
I couldn't twitter you couldn't twitter she couldn't twitter we couldn't twitter you couldn't twitter they couldn't twitter	I couldn't be twittering you couldn't be twittering she couldn't be twittering we couldn't be twittering you couldn't be twittering they couldn't be twittering
Perfect	V-ing perfect
I couldn't have twittered you couldn't have twittered she couldn't have twittered we couldn't have twittered you couldn't have twittered they couldn't have twittered	I couldn't have been twittering you couldn't have been twittering she couldn't have been twittering we couldn't have been twittering you couldn't have been twittering they couldn't have been twittering

Interrogative form

Simple form	V-ing form
could I twitter? could you twitter? could she twitter? could we twitter? could you twitter? could they twitter?	could I be twittering? could you be twittering? could she be twittering? could we be twittering? could you be twittering? could they be twittering?
Perfect	V-ing perfect
could I have twittered? could you have twittered? could she have twittered? could we have twittered? could you have twittered? could they have twittered?	could I have been twittering? could you have been twittering? could she have been twittering? could we have been twittering? could you have been twittering? could they have been twittering?

Interro-negative form

Simple form	V-ing form
couldn't I twitter? couldn't you twitter? couldn't she twitter? couldn't we twitter? couldn't you twitter? couldn't they twitter?	couldn't I be twittering? couldn't you be twittering? couldn't she be twittering? couldn't we be twittering? couldn't you be twittering? couldn't they be twittering?
Perfect	V-ing perfect
couldn't I have twittered? couldn't you have twittered? couldn't she have twittered? couldn't we have twittered? couldn't you have twittered? couldn't they have twittered?	couldn't I have been twittering? couldn't you have been twittering? couldn't she have been twittering? couldn't we have been twittering? couldn't you have been twittering? couldn't they have been twittering?