I can omit you can omit she can omit we can omit you can omit they can omit
V-ing form
I can be omitting you can be omitting she can be omitting we can be omitting you can be omitting they can be omitting
Perfect
I can have omitted you can have omitted she 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 she 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 she 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 she 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 she 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 she 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 she omit? can we omit? can you omit? can they omit?
V-ing form
can I be omitting? can you be omitting? can she be omitting? can we be omitting? can you be omitting? can they be omitting?
Perfect
can I have omitted? can you have omitted? can she 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 she 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 she 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 she 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 she 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 she have been omitting? can't we have been omitting? can't you have been omitting? can't they have been omitting?