should yak
Regular verb: yak - yaked- yaked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should yak
you should yak
she should yak
we should yak
you should yak
they should yak 	I should be yaking
you should be yaking
she should be yaking
we should be yaking
you should be yaking
they should be yaking	I should have yaked
you should have yaked
she should have yaked
we should have yaked
you should have yaked
they should have yaked	I should have been yaking
you should have been yaking
she should have been yaking
we should have been yaking
you should have been yaking
they should have been yaking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should not yak
you should not yak
she should not yak
we should not yak
you should not yak
they should not yak 	I should not be yaking
you should not be yaking
she should not be yaking
we should not be yaking
you should not be yaking
they should not be yaking	I should not have yaked
you should not have yaked
she should not have yaked
we should not have yaked
you should not have yaked
they should not have yaked	I should not have been yaking
you should not have been yaking
she should not have been yaking
we should not have been yaking
you should not have been yaking
they should not have been yaking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I yak?
should you yak?
should she yak?
should we yak?
should you yak?
should they yak? 	should I be yaking?
should you be yaking?
should she be yaking?
should we be yaking?
should you be yaking?
should they be yaking? 	should I have yaked?
should you have yaked?
should she have yaked?
should we have yaked?
should you have yaked?
should they have yaked? 	should I have been yaking?
should you have been yaking?
should she have been yaking?
should we have been yaking?
should you have been yaking?
should they have been yaking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I not yak?
should you not yak?
should she not yak?
should we not yak?
should you not yak?
should they not yak? 	should I not be yaking?
should you not be yaking?
should she not be yaking?
should we not be yaking?
should you not be yaking?
should they not be yaking? 	should I not have yaked?
should you not have yaked?
should she not have yaked?
should we not have yaked?
should you not have yaked?
should they not have yaked? 	should I not have been yaking?
should you not have been yaking?
should she not have been yaking?
should we not have been yaking?
should you not have been yaking?
should they not have been yaking?