English verb conjugation
CAN YAK

Regular verb: yak - yaked - yaked

Affirmation

Simple form	V-ing form
I can yak you can yak he can yak we can yak you can yak they can yak	I can be yaking you can be yaking he can be yaking we can be yaking you can be yaking they can be yaking
Perfect	V-ing perfect
I can have yaked you can have yaked he can have yaked we can have yaked you can have yaked they can have yaked	I can have been yaking you can have been yaking he can have been yaking we can have been yaking you can have been yaking they can have been yaking

Negation

Simple form	V-ing form
I can't yak you can't yak he can't yak we can't yak you can't yak they can't yak	I can't be yaking you can't be yaking he can't be yaking we can't be yaking you can't be yaking they can't be yaking
Perfect	V-ing perfect
I can't have yaked you can't have yaked he can't have yaked we can't have yaked you can't have yaked they can't have yaked	I can't have been yaking you can't have been yaking he can't have been yaking we can't have been yaking you can't have been yaking they can't have been yaking

Interrogative form

Simple form	V-ing form
can I yak? can you yak? can he yak? can we yak? can you yak? can they yak?	can I be yaking? can you be yaking? can he be yaking? can we be yaking? can you be yaking? can they be yaking?
Perfect	V-ing perfect
can I have yaked? can you have yaked? can he have yaked? can we have yaked? can you have yaked? can they have yaked?	can I have been yaking? can you have been yaking? can he have been yaking? can we have been yaking? can you have been yaking? can they have been yaking?

Interro-negative form

Simple form	V-ing form
can't I yak? can't you yak? can't he yak? can't we yak? can't you yak? can't they yak?	can't I be yaking? can't you be yaking? can't he be yaking? can't we be yaking? can't you be yaking? can't they be yaking?
Perfect	V-ing perfect
can't I have yaked? can't you have yaked? can't he have yaked? can't we have yaked? can't you have yaked? can't they have yaked?	can't I have been yaking? can't you have been yaking? can't he have been yaking? can't we have been yaking? can't you have been yaking? can't they have been yaking?