I can omit you can omit he can omit we can omit you can omit they can omit
V-ing form
I can be omitting you can be omitting he can be omitting we can be omitting you can be omitting they can be omitting
Perfect
I can have omitted you can have omitted he can have omitted we can have omitted you can have omitted they can have omitted
V-ing perfect
I can have been omitting you can have been omitting he can have been omitting we can have been omitting you can have been omitting they can have been omitting
Negation
Simple form
I can't omit you can't omit he can't omit we can't omit you can't omit they can't omit
V-ing form
I can't be omitting you can't be omitting he can't be omitting we can't be omitting you can't be omitting they can't be omitting
Perfect
I can't have omitted you can't have omitted he can't have omitted we can't have omitted you can't have omitted they can't have omitted
V-ing perfect
I can't have been omitting you can't have been omitting he can't have been omitting we can't have been omitting you can't have been omitting they can't have been omitting
Interrogative form
Simple form
can I omit? can you omit? can he omit? can we omit? can you omit? can they omit?
V-ing form
can I be omitting? can you be omitting? can he be omitting? can we be omitting? can you be omitting? can they be omitting?
Perfect
can I have omitted? can you have omitted? can he have omitted? can we have omitted? can you have omitted? can they have omitted?
V-ing perfect
can I have been omitting? can you have been omitting? can he have been omitting? can we have been omitting? can you have been omitting? can they have been omitting?
Interro-negative form
Simple form
can't I omit? can't you omit? can't he omit? can't we omit? can't you omit? can't they omit?
V-ing form
can't I be omitting? can't you be omitting? can't he be omitting? can't we be omitting? can't you be omitting? can't they be omitting?
Perfect
can't I have omitted? can't you have omitted? can't he have omitted? can't we have omitted? can't you have omitted? can't they have omitted?
V-ing perfect
can't I have been omitting? can't you have been omitting? can't he have been omitting? can't we have been omitting? can't you have been omitting? can't they have been omitting?