I can quintuple you can quintuple he can quintuple we can quintuple you can quintuple they can quintuple
V-ing form
I can be quintupling you can be quintupling he can be quintupling we can be quintupling you can be quintupling they can be quintupling
Perfect
I can have quintupled you can have quintupled he 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 he can have been quintupling we can have been quintupling you can have been quintupling they can have been quintupling
Negation
Simple form
I cannot quintuple you cannot quintuple he cannot quintuple we cannot quintuple you cannot quintuple they cannot quintuple
V-ing form
I cannot be quintupling you cannot be quintupling he cannot be quintupling we cannot be quintupling you cannot be quintupling they cannot be quintupling
Perfect
I cannot have quintupled you cannot have quintupled he cannot have quintupled we cannot have quintupled you cannot have quintupled they cannot have quintupled
V-ing perfect
I cannot have been quintupling you cannot have been quintupling he cannot have been quintupling we cannot have been quintupling you cannot have been quintupling they cannot have been quintupling
Interrogative form
Simple form
can I quintuple? can you quintuple? can he quintuple? can we quintuple? can you quintuple? can they quintuple?
V-ing form
can I be quintupling? can you be quintupling? can he be quintupling? can we be quintupling? can you be quintupling? can they be quintupling?
Perfect
can I have quintupled? can you have quintupled? can he 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 he have been quintupling? can we have been quintupling? can you have been quintupling? can they have been quintupling?
Interro-negative form
Simple form
can I not quintuple? can you not quintuple? can he not quintuple? can we not quintuple? can you not quintuple? can they not quintuple?
V-ing form
can I not be quintupling? can you not be quintupling? can he not be quintupling? can we not be quintupling? can you not be quintupling? can they not be quintupling?
Perfect
can I not have quintupled? can you not have quintupled? can he not have quintupled? can we not have quintupled? can you not have quintupled? can they not have quintupled?
V-ing perfect
can I not have been quintupling? can you not have been quintupling? can he not have been quintupling? can we not have been quintupling? can you not have been quintupling? can they not have been quintupling?