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 cannot yak you cannot yak he cannot yak we cannot yak you cannot yak they cannot yak	I cannot be yaking you cannot be yaking he cannot be yaking we cannot be yaking you cannot be yaking they cannot be yaking
Perfect	V-ing perfect
I cannot have yaked you cannot have yaked he cannot have yaked we cannot have yaked you cannot have yaked they cannot have yaked	I cannot have been yaking you cannot have been yaking he cannot have been yaking we cannot have been yaking you cannot have been yaking they cannot 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 I not yak? can you not yak? can he not yak? can we not yak? can you not yak? can they not yak?	can I not be yaking? can you not be yaking? can he not be yaking? can we not be yaking? can you not be yaking? can they not be yaking?
Perfect	V-ing perfect
can I not have yaked? can you not have yaked? can he not have yaked? can we not have yaked? can you not have yaked? can they not have yaked?	can I not have been yaking? can you not have been yaking? can he not have been yaking? can we not have been yaking? can you not have been yaking? can they not have been yaking?