I can labor you can labor he can labor we can labor you can labor they can labor
V-ing form
I can be laboring you can be laboring he can be laboring we can be laboring you can be laboring they can be laboring
Perfect
I can have labored you can have labored he can have labored we can have labored you can have labored they can have labored
V-ing perfect
I can have been laboring you can have been laboring he can have been laboring we can have been laboring you can have been laboring they can have been laboring
Negation
Simple form
I can't labor you can't labor he can't labor we can't labor you can't labor they can't labor
V-ing form
I can't be laboring you can't be laboring he can't be laboring we can't be laboring you can't be laboring they can't be laboring
Perfect
I can't have labored you can't have labored he can't have labored we can't have labored you can't have labored they can't have labored
V-ing perfect
I can't have been laboring you can't have been laboring he can't have been laboring we can't have been laboring you can't have been laboring they can't have been laboring
Interrogative form
Simple form
can I labor? can you labor? can he labor? can we labor? can you labor? can they labor?
V-ing form
can I be laboring? can you be laboring? can he be laboring? can we be laboring? can you be laboring? can they be laboring?
Perfect
can I have labored? can you have labored? can he have labored? can we have labored? can you have labored? can they have labored?
V-ing perfect
can I have been laboring? can you have been laboring? can he have been laboring? can we have been laboring? can you have been laboring? can they have been laboring?
Interro-negative form
Simple form
can't I labor? can't you labor? can't he labor? can't we labor? can't you labor? can't they labor?
V-ing form
can't I be laboring? can't you be laboring? can't he be laboring? can't we be laboring? can't you be laboring? can't they be laboring?
Perfect
can't I have labored? can't you have labored? can't he have labored? can't we have labored? can't you have labored? can't they have labored?
V-ing perfect
can't I have been laboring? can't you have been laboring? can't he have been laboring? can't we have been laboring? can't you have been laboring? can't they have been laboring?