English verb conjugation
CAN FORM

Regular verb: form - formed - formed

Affirmation

Simple form	V-ing form
I can form you can form he can form we can form you can form they can form	I can be forming you can be forming he can be forming we can be forming you can be forming they can be forming
Perfect	V-ing perfect
I can have formed you can have formed he can have formed we can have formed you can have formed they can have formed	I can have been forming you can have been forming he can have been forming we can have been forming you can have been forming they can have been forming

Negation

Simple form	V-ing form
I cannot form you cannot form he cannot form we cannot form you cannot form they cannot form	I cannot be forming you cannot be forming he cannot be forming we cannot be forming you cannot be forming they cannot be forming
Perfect	V-ing perfect
I cannot have formed you cannot have formed he cannot have formed we cannot have formed you cannot have formed they cannot have formed	I cannot have been forming you cannot have been forming he cannot have been forming we cannot have been forming you cannot have been forming they cannot have been forming

Interrogative form

Simple form	V-ing form
can I form? can you form? can he form? can we form? can you form? can they form?	can I be forming? can you be forming? can he be forming? can we be forming? can you be forming? can they be forming?
Perfect	V-ing perfect
can I have formed? can you have formed? can he have formed? can we have formed? can you have formed? can they have formed?	can I have been forming? can you have been forming? can he have been forming? can we have been forming? can you have been forming? can they have been forming?

Interro-negative form

Simple form	V-ing form
can I not form? can you not form? can he not form? can we not form? can you not form? can they not form?	can I not be forming? can you not be forming? can he not be forming? can we not be forming? can you not be forming? can they not be forming?
Perfect	V-ing perfect
can I not have formed? can you not have formed? can he not have formed? can we not have formed? can you not have formed? can they not have formed?	can I not have been forming? can you not have been forming? can he not have been forming? can we not have been forming? can you not have been forming? can they not have been forming?