I can toil you can toil he can toil we can toil you can toil they can toil
V-ing form
I can be toiling you can be toiling he can be toiling we can be toiling you can be toiling they can be toiling
Perfect
I can have toiled you can have toiled he 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 he can have been toiling we can have been toiling you can have been toiling they can have been toiling
Negation
Simple form
I can't toil you can't toil he can't toil we can't toil you can't toil they can't toil
V-ing form
I can't be toiling you can't be toiling he can't be toiling we can't be toiling you can't be toiling they can't be toiling
Perfect
I can't have toiled you can't have toiled he can't have toiled we can't have toiled you can't have toiled they can't have toiled
V-ing perfect
I can't have been toiling you can't have been toiling he can't have been toiling we can't have been toiling you can't have been toiling they can't have been toiling
Interrogative form
Simple form
can I toil? can you toil? can he toil? can we toil? can you toil? can they toil?
V-ing form
can I be toiling? can you be toiling? can he be toiling? can we be toiling? can you be toiling? can they be toiling?
Perfect
can I have toiled? can you have toiled? can he 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 he have been toiling? can we have been toiling? can you have been toiling? can they have been toiling?
Interro-negative form
Simple form
can't I toil? can't you toil? can't he toil? can't we toil? can't you toil? can't they toil?
V-ing form
can't I be toiling? can't you be toiling? can't he be toiling? can't we be toiling? can't you be toiling? can't they be toiling?
Perfect
can't I have toiled? can't you have toiled? can't he have toiled? can't we have toiled? can't you have toiled? can't they have toiled?
V-ing perfect
can't I have been toiling? can't you have been toiling? can't he have been toiling? can't we have been toiling? can't you have been toiling? can't they have been toiling?