I can quintuple you can quintuple she can quintuple we can quintuple you can quintuple they can quintuple
V-ing form
I can be quintupling you can be quintupling she can be quintupling we can be quintupling you can be quintupling they can be quintupling
Perfect
I can have quintupled you can have quintupled she can have quintupled we can have quintupled you can have quintupled they can have quintupled
V-ing perfect
I can have been quintupling you can have been quintupling she can have been quintupling we can have been quintupling you can have been quintupling they can have been quintupling
Negation
Simple form
I can't quintuple you can't quintuple she can't quintuple we can't quintuple you can't quintuple they can't quintuple
V-ing form
I can't be quintupling you can't be quintupling she can't be quintupling we can't be quintupling you can't be quintupling they can't be quintupling
Perfect
I can't have quintupled you can't have quintupled she can't have quintupled we can't have quintupled you can't have quintupled they can't have quintupled
V-ing perfect
I can't have been quintupling you can't have been quintupling she can't have been quintupling we can't have been quintupling you can't have been quintupling they can't have been quintupling
Interrogative form
Simple form
can I quintuple? can you quintuple? can she quintuple? can we quintuple? can you quintuple? can they quintuple?
V-ing form
can I be quintupling? can you be quintupling? can she be quintupling? can we be quintupling? can you be quintupling? can they be quintupling?
Perfect
can I have quintupled? can you have quintupled? can she have quintupled? can we have quintupled? can you have quintupled? can they have quintupled?
V-ing perfect
can I have been quintupling? can you have been quintupling? can she have been quintupling? can we have been quintupling? can you have been quintupling? can they have been quintupling?
Interro-negative form
Simple form
can't I quintuple? can't you quintuple? can't she quintuple? can't we quintuple? can't you quintuple? can't they quintuple?
V-ing form
can't I be quintupling? can't you be quintupling? can't she be quintupling? can't we be quintupling? can't you be quintupling? can't they be quintupling?
Perfect
can't I have quintupled? can't you have quintupled? can't she have quintupled? can't we have quintupled? can't you have quintupled? can't they have quintupled?
V-ing perfect
can't I have been quintupling? can't you have been quintupling? can't she have been quintupling? can't we have been quintupling? can't you have been quintupling? can't they have been quintupling?