English verb conjugation
COULD ATTAIN

Regular verb: attain - attained - attained

Affirmation

Simple form	V-ing form
I could attain you could attain she could attain we could attain you could attain they could attain	I could be attaining you could be attaining she could be attaining we could be attaining you could be attaining they could be attaining
Perfect	V-ing perfect
I could have attained you could have attained she could have attained we could have attained you could have attained they could have attained	I could have been attaining you could have been attaining she could have been attaining we could have been attaining you could have been attaining they could have been attaining

Negation

Simple form	V-ing form
I couldn't attain you couldn't attain she couldn't attain we couldn't attain you couldn't attain they couldn't attain	I couldn't be attaining you couldn't be attaining she couldn't be attaining we couldn't be attaining you couldn't be attaining they couldn't be attaining
Perfect	V-ing perfect
I couldn't have attained you couldn't have attained she couldn't have attained we couldn't have attained you couldn't have attained they couldn't have attained	I couldn't have been attaining you couldn't have been attaining she couldn't have been attaining we couldn't have been attaining you couldn't have been attaining they couldn't have been attaining

Interrogative form

Simple form	V-ing form
could I attain? could you attain? could she attain? could we attain? could you attain? could they attain?	could I be attaining? could you be attaining? could she be attaining? could we be attaining? could you be attaining? could they be attaining?
Perfect	V-ing perfect
could I have attained? could you have attained? could she have attained? could we have attained? could you have attained? could they have attained?	could I have been attaining? could you have been attaining? could she have been attaining? could we have been attaining? could you have been attaining? could they have been attaining?

Interro-negative form

Simple form	V-ing form
couldn't I attain? couldn't you attain? couldn't she attain? couldn't we attain? couldn't you attain? couldn't they attain?	couldn't I be attaining? couldn't you be attaining? couldn't she be attaining? couldn't we be attaining? couldn't you be attaining? couldn't they be attaining?
Perfect	V-ing perfect
couldn't I have attained? couldn't you have attained? couldn't she have attained? couldn't we have attained? couldn't you have attained? couldn't they have attained?	couldn't I have been attaining? couldn't you have been attaining? couldn't she have been attaining? couldn't we have been attaining? couldn't you have been attaining? couldn't they have been attaining?