I can toil you can toil she can toil we can toil you can toil they can toil
V-ing form
I can be toiling you can be toiling she can be toiling we can be toiling you can be toiling they can be toiling
Perfect
I can have toiled you can have toiled she can have toiled we can have toiled you can have toiled they can have toiled
V-ing perfect
I can have been toiling you can have been toiling she can have been toiling we can have been toiling you can have been toiling they can have been toiling
Negation
Simple form
I cannot toil you cannot toil she cannot toil we cannot toil you cannot toil they cannot toil
V-ing form
I cannot be toiling you cannot be toiling she cannot be toiling we cannot be toiling you cannot be toiling they cannot be toiling
Perfect
I cannot have toiled you cannot have toiled she cannot have toiled we cannot have toiled you cannot have toiled they cannot have toiled
V-ing perfect
I cannot have been toiling you cannot have been toiling she cannot have been toiling we cannot have been toiling you cannot have been toiling they cannot have been toiling
Interrogative form
Simple form
can I toil? can you toil? can she toil? can we toil? can you toil? can they toil?
V-ing form
can I be toiling? can you be toiling? can she be toiling? can we be toiling? can you be toiling? can they be toiling?
Perfect
can I have toiled? can you have toiled? can she have toiled? can we have toiled? can you have toiled? can they have toiled?
V-ing perfect
can I have been toiling? can you have been toiling? can she have been toiling? can we have been toiling? can you have been toiling? can they have been toiling?
Interro-negative form
Simple form
can I not toil? can you not toil? can she not toil? can we not toil? can you not toil? can they not toil?
V-ing form
can I not be toiling? can you not be toiling? can she not be toiling? can we not be toiling? can you not be toiling? can they not be toiling?
Perfect
can I not have toiled? can you not have toiled? can she not have toiled? can we not have toiled? can you not have toiled? can they not have toiled?
V-ing perfect
can I not have been toiling? can you not have been toiling? can she not have been toiling? can we not have been toiling? can you not have been toiling? can they not have been toiling?