I can lunch you can lunch he can lunch we can lunch you can lunch they can lunch
V-ing form
I can be lunching you can be lunching he can be lunching we can be lunching you can be lunching they can be lunching
Perfect
I can have lunched you can have lunched he can have lunched we can have lunched you can have lunched they can have lunched
V-ing perfect
I can have been lunching you can have been lunching he can have been lunching we can have been lunching you can have been lunching they can have been lunching
Negation
Simple form
I can't lunch you can't lunch he can't lunch we can't lunch you can't lunch they can't lunch
V-ing form
I can't be lunching you can't be lunching he can't be lunching we can't be lunching you can't be lunching they can't be lunching
Perfect
I can't have lunched you can't have lunched he can't have lunched we can't have lunched you can't have lunched they can't have lunched
V-ing perfect
I can't have been lunching you can't have been lunching he can't have been lunching we can't have been lunching you can't have been lunching they can't have been lunching
Interrogative form
Simple form
can I lunch? can you lunch? can he lunch? can we lunch? can you lunch? can they lunch?
V-ing form
can I be lunching? can you be lunching? can he be lunching? can we be lunching? can you be lunching? can they be lunching?
Perfect
can I have lunched? can you have lunched? can he have lunched? can we have lunched? can you have lunched? can they have lunched?
V-ing perfect
can I have been lunching? can you have been lunching? can he have been lunching? can we have been lunching? can you have been lunching? can they have been lunching?
Interro-negative form
Simple form
can't I lunch? can't you lunch? can't he lunch? can't we lunch? can't you lunch? can't they lunch?
V-ing form
can't I be lunching? can't you be lunching? can't he be lunching? can't we be lunching? can't you be lunching? can't they be lunching?
Perfect
can't I have lunched? can't you have lunched? can't he have lunched? can't we have lunched? can't you have lunched? can't they have lunched?
V-ing perfect
can't I have been lunching? can't you have been lunching? can't he have been lunching? can't we have been lunching? can't you have been lunching? can't they have been lunching?