I can triple you can triple he can triple we can triple you can triple they can triple
V-ing form
I can be tripling you can be tripling he can be tripling we can be tripling you can be tripling they can be tripling
Perfect
I can have tripled you can have tripled he can have tripled we can have tripled you can have tripled they can have tripled
V-ing perfect
I can have been tripling you can have been tripling he can have been tripling we can have been tripling you can have been tripling they can have been tripling
Negation
Simple form
I can't triple you can't triple he can't triple we can't triple you can't triple they can't triple
V-ing form
I can't be tripling you can't be tripling he can't be tripling we can't be tripling you can't be tripling they can't be tripling
Perfect
I can't have tripled you can't have tripled he can't have tripled we can't have tripled you can't have tripled they can't have tripled
V-ing perfect
I can't have been tripling you can't have been tripling he can't have been tripling we can't have been tripling you can't have been tripling they can't have been tripling
Interrogative form
Simple form
can I triple? can you triple? can he triple? can we triple? can you triple? can they triple?
V-ing form
can I be tripling? can you be tripling? can he be tripling? can we be tripling? can you be tripling? can they be tripling?
Perfect
can I have tripled? can you have tripled? can he have tripled? can we have tripled? can you have tripled? can they have tripled?
V-ing perfect
can I have been tripling? can you have been tripling? can he have been tripling? can we have been tripling? can you have been tripling? can they have been tripling?
Interro-negative form
Simple form
can't I triple? can't you triple? can't he triple? can't we triple? can't you triple? can't they triple?
V-ing form
can't I be tripling? can't you be tripling? can't he be tripling? can't we be tripling? can't you be tripling? can't they be tripling?
Perfect
can't I have tripled? can't you have tripled? can't he have tripled? can't we have tripled? can't you have tripled? can't they have tripled?
V-ing perfect
can't I have been tripling? can't you have been tripling? can't he have been tripling? can't we have been tripling? can't you have been tripling? can't they have been tripling?