English verb conjugation
COULD QUINTUPLE

Regular verb: quintuple - quintupled - quintupled

Affirmation

Simple form	V-ing form
I could quintuple you could quintuple she could quintuple we could quintuple you could quintuple they could quintuple	I could be quintupling you could be quintupling she could be quintupling we could be quintupling you could be quintupling they could be quintupling
Perfect	V-ing perfect
I could have quintupled you could have quintupled she could have quintupled we could have quintupled you could have quintupled they could have quintupled	I could have been quintupling you could have been quintupling she could have been quintupling we could have been quintupling you could have been quintupling they could have been quintupling

Negation

Simple form	V-ing form
I couldn't quintuple you couldn't quintuple she couldn't quintuple we couldn't quintuple you couldn't quintuple they couldn't quintuple	I couldn't be quintupling you couldn't be quintupling she couldn't be quintupling we couldn't be quintupling you couldn't be quintupling they couldn't be quintupling
Perfect	V-ing perfect
I couldn't have quintupled you couldn't have quintupled she couldn't have quintupled we couldn't have quintupled you couldn't have quintupled they couldn't have quintupled	I couldn't have been quintupling you couldn't have been quintupling she couldn't have been quintupling we couldn't have been quintupling you couldn't have been quintupling they couldn't have been quintupling

Interrogative form

Simple form	V-ing form
could I quintuple? could you quintuple? could she quintuple? could we quintuple? could you quintuple? could they quintuple?	could I be quintupling? could you be quintupling? could she be quintupling? could we be quintupling? could you be quintupling? could they be quintupling?
Perfect	V-ing perfect
could I have quintupled? could you have quintupled? could she have quintupled? could we have quintupled? could you have quintupled? could they have quintupled?	could I have been quintupling? could you have been quintupling? could she have been quintupling? could we have been quintupling? could you have been quintupling? could they have been quintupling?

Interro-negative form

Simple form	V-ing form
couldn't I quintuple? couldn't you quintuple? couldn't she quintuple? couldn't we quintuple? couldn't you quintuple? couldn't they quintuple?	couldn't I be quintupling? couldn't you be quintupling? couldn't she be quintupling? couldn't we be quintupling? couldn't you be quintupling? couldn't they be quintupling?
Perfect	V-ing perfect
couldn't I have quintupled? couldn't you have quintupled? couldn't she have quintupled? couldn't we have quintupled? couldn't you have quintupled? couldn't they have quintupled?	couldn't I have been quintupling? couldn't you have been quintupling? couldn't she have been quintupling? couldn't we have been quintupling? couldn't you have been quintupling? couldn't they have been quintupling?