English verb conjugation
COULD COLLECT

Regular verb: collect - collected - collected

Affirmation

Simple form	V-ing form
I could collect you could collect she could collect we could collect you could collect they could collect	I could be collecting you could be collecting she could be collecting we could be collecting you could be collecting they could be collecting
Perfect	V-ing perfect
I could have collected you could have collected she could have collected we could have collected you could have collected they could have collected	I could have been collecting you could have been collecting she could have been collecting we could have been collecting you could have been collecting they could have been collecting

Negation

Simple form	V-ing form
I couldn't collect you couldn't collect she couldn't collect we couldn't collect you couldn't collect they couldn't collect	I couldn't be collecting you couldn't be collecting she couldn't be collecting we couldn't be collecting you couldn't be collecting they couldn't be collecting
Perfect	V-ing perfect
I couldn't have collected you couldn't have collected she couldn't have collected we couldn't have collected you couldn't have collected they couldn't have collected	I couldn't have been collecting you couldn't have been collecting she couldn't have been collecting we couldn't have been collecting you couldn't have been collecting they couldn't have been collecting

Interrogative form

Simple form	V-ing form
could I collect? could you collect? could she collect? could we collect? could you collect? could they collect?	could I be collecting? could you be collecting? could she be collecting? could we be collecting? could you be collecting? could they be collecting?
Perfect	V-ing perfect
could I have collected? could you have collected? could she have collected? could we have collected? could you have collected? could they have collected?	could I have been collecting? could you have been collecting? could she have been collecting? could we have been collecting? could you have been collecting? could they have been collecting?

Interro-negative form

Simple form	V-ing form
couldn't I collect? couldn't you collect? couldn't she collect? couldn't we collect? couldn't you collect? couldn't they collect?	couldn't I be collecting? couldn't you be collecting? couldn't she be collecting? couldn't we be collecting? couldn't you be collecting? couldn't they be collecting?
Perfect	V-ing perfect
couldn't I have collected? couldn't you have collected? couldn't she have collected? couldn't we have collected? couldn't you have collected? couldn't they have collected?	couldn't I have been collecting? couldn't you have been collecting? couldn't she have been collecting? couldn't we have been collecting? couldn't you have been collecting? couldn't they have been collecting?