I can explain you can explain she can explain we can explain you can explain they can explain
V-ing form
I can be explaining you can be explaining she can be explaining we can be explaining you can be explaining they can be explaining
Perfect
I can have explained you can have explained she can have explained we can have explained you can have explained they can have explained
V-ing perfect
I can have been explaining you can have been explaining she can have been explaining we can have been explaining you can have been explaining they can have been explaining
Negation
Simple form
I cannot explain you cannot explain she cannot explain we cannot explain you cannot explain they cannot explain
V-ing form
I cannot be explaining you cannot be explaining she cannot be explaining we cannot be explaining you cannot be explaining they cannot be explaining
Perfect
I cannot have explained you cannot have explained she cannot have explained we cannot have explained you cannot have explained they cannot have explained
V-ing perfect
I cannot have been explaining you cannot have been explaining she cannot have been explaining we cannot have been explaining you cannot have been explaining they cannot have been explaining
Interrogative form
Simple form
can I explain? can you explain? can she explain? can we explain? can you explain? can they explain?
V-ing form
can I be explaining? can you be explaining? can she be explaining? can we be explaining? can you be explaining? can they be explaining?
Perfect
can I have explained? can you have explained? can she have explained? can we have explained? can you have explained? can they have explained?
V-ing perfect
can I have been explaining? can you have been explaining? can she have been explaining? can we have been explaining? can you have been explaining? can they have been explaining?
Interro-negative form
Simple form
can I not explain? can you not explain? can she not explain? can we not explain? can you not explain? can they not explain?
V-ing form
can I not be explaining? can you not be explaining? can she not be explaining? can we not be explaining? can you not be explaining? can they not be explaining?
Perfect
can I not have explained? can you not have explained? can she not have explained? can we not have explained? can you not have explained? can they not have explained?
V-ing perfect
can I not have been explaining? can you not have been explaining? can she not have been explaining? can we not have been explaining? can you not have been explaining? can they not have been explaining?