I can substantiate you can substantiate she can substantiate we can substantiate you can substantiate they can substantiate
V-ing form
I can be substantiating you can be substantiating she can be substantiating we can be substantiating you can be substantiating they can be substantiating
Perfect
I can have substantiated you can have substantiated she can have substantiated we can have substantiated you can have substantiated they can have substantiated
V-ing perfect
I can have been substantiating you can have been substantiating she can have been substantiating we can have been substantiating you can have been substantiating they can have been substantiating
Negation
Simple form
I cannot substantiate you cannot substantiate she cannot substantiate we cannot substantiate you cannot substantiate they cannot substantiate
V-ing form
I cannot be substantiating you cannot be substantiating she cannot be substantiating we cannot be substantiating you cannot be substantiating they cannot be substantiating
Perfect
I cannot have substantiated you cannot have substantiated she cannot have substantiated we cannot have substantiated you cannot have substantiated they cannot have substantiated
V-ing perfect
I cannot have been substantiating you cannot have been substantiating she cannot have been substantiating we cannot have been substantiating you cannot have been substantiating they cannot have been substantiating
Interrogative form
Simple form
can I substantiate? can you substantiate? can she substantiate? can we substantiate? can you substantiate? can they substantiate?
V-ing form
can I be substantiating? can you be substantiating? can she be substantiating? can we be substantiating? can you be substantiating? can they be substantiating?
Perfect
can I have substantiated? can you have substantiated? can she have substantiated? can we have substantiated? can you have substantiated? can they have substantiated?
V-ing perfect
can I have been substantiating? can you have been substantiating? can she have been substantiating? can we have been substantiating? can you have been substantiating? can they have been substantiating?
Interro-negative form
Simple form
can I not substantiate? can you not substantiate? can she not substantiate? can we not substantiate? can you not substantiate? can they not substantiate?
V-ing form
can I not be substantiating? can you not be substantiating? can she not be substantiating? can we not be substantiating? can you not be substantiating? can they not be substantiating?
Perfect
can I not have substantiated? can you not have substantiated? can she not have substantiated? can we not have substantiated? can you not have substantiated? can they not have substantiated?
V-ing perfect
can I not have been substantiating? can you not have been substantiating? can she not have been substantiating? can we not have been substantiating? can you not have been substantiating? can they not have been substantiating?