I can labor you can labor she can labor we can labor you can labor they can labor
V-ing form
I can be laboring you can be laboring she can be laboring we can be laboring you can be laboring they can be laboring
Perfect
I can have labored you can have labored she 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 she can have been laboring we can have been laboring you can have been laboring they can have been laboring
Negation
Simple form
I cannot labor you cannot labor she cannot labor we cannot labor you cannot labor they cannot labor
V-ing form
I cannot be laboring you cannot be laboring she cannot be laboring we cannot be laboring you cannot be laboring they cannot be laboring
Perfect
I cannot have labored you cannot have labored she cannot have labored we cannot have labored you cannot have labored they cannot have labored
V-ing perfect
I cannot have been laboring you cannot have been laboring she cannot have been laboring we cannot have been laboring you cannot have been laboring they cannot have been laboring
Interrogative form
Simple form
can I labor? can you labor? can she labor? can we labor? can you labor? can they labor?
V-ing form
can I be laboring? can you be laboring? can she be laboring? can we be laboring? can you be laboring? can they be laboring?
Perfect
can I have labored? can you have labored? can she 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 she have been laboring? can we have been laboring? can you have been laboring? can they have been laboring?
Interro-negative form
Simple form
can I not labor? can you not labor? can she not labor? can we not labor? can you not labor? can they not labor?
V-ing form
can I not be laboring? can you not be laboring? can she not be laboring? can we not be laboring? can you not be laboring? can they not be laboring?
Perfect
can I not have labored? can you not have labored? can she not have labored? can we not have labored? can you not have labored? can they not have labored?
V-ing perfect
can I not have been laboring? can you not have been laboring? can she not have been laboring? can we not have been laboring? can you not have been laboring? can they not have been laboring?