English verb conjugation
COULD DETAIN

Regular verb: detain - detained - detained

Affirmation

Simple form	V-ing form
I could detain you could detain he could detain we could detain you could detain they could detain	I could be detaining you could be detaining he could be detaining we could be detaining you could be detaining they could be detaining
Perfect	V-ing perfect
I could have detained you could have detained he could have detained we could have detained you could have detained they could have detained	I could have been detaining you could have been detaining he could have been detaining we could have been detaining you could have been detaining they could have been detaining

Negation

Simple form	V-ing form
I couldn't detain you couldn't detain he couldn't detain we couldn't detain you couldn't detain they couldn't detain	I couldn't be detaining you couldn't be detaining he couldn't be detaining we couldn't be detaining you couldn't be detaining they couldn't be detaining
Perfect	V-ing perfect
I couldn't have detained you couldn't have detained he couldn't have detained we couldn't have detained you couldn't have detained they couldn't have detained	I couldn't have been detaining you couldn't have been detaining he couldn't have been detaining we couldn't have been detaining you couldn't have been detaining they couldn't have been detaining

Interrogative form

Simple form	V-ing form
could I detain? could you detain? could he detain? could we detain? could you detain? could they detain?	could I be detaining? could you be detaining? could he be detaining? could we be detaining? could you be detaining? could they be detaining?
Perfect	V-ing perfect
could I have detained? could you have detained? could he have detained? could we have detained? could you have detained? could they have detained?	could I have been detaining? could you have been detaining? could he have been detaining? could we have been detaining? could you have been detaining? could they have been detaining?

Interro-negative form

Simple form	V-ing form
couldn't I detain? couldn't you detain? couldn't he detain? couldn't we detain? couldn't you detain? couldn't they detain?	couldn't I be detaining? couldn't you be detaining? couldn't he be detaining? couldn't we be detaining? couldn't you be detaining? couldn't they be detaining?
Perfect	V-ing perfect
couldn't I have detained? couldn't you have detained? couldn't he have detained? couldn't we have detained? couldn't you have detained? couldn't they have detained?	couldn't I have been detaining? couldn't you have been detaining? couldn't he have been detaining? couldn't we have been detaining? couldn't you have been detaining? couldn't they have been detaining?