I can write you can write she can write we can write you can write they can write
Forma con V-ing
I can be writing you can be writing she can be writing we can be writing you can be writing they can be writing
Perfecto
I can have written you can have written she can have written we can have written you can have written they can have written
Perfecto con V-ing
I can have been writing you can have been writing she can have been writing we can have been writing you can have been writing they can have been writing
Negación
Forma simple
I can't write you can't write she can't write we can't write you can't write they can't write
Forma con V-ing
I can't be writing you can't be writing she can't be writing we can't be writing you can't be writing they can't be writing
Perfecto
I can't have written you can't have written she can't have written we can't have written you can't have written they can't have written
Perfecto con V-ing
I can't have been writing you can't have been writing she can't have been writing we can't have been writing you can't have been writing they can't have been writing
Forma interrogativa
Forma simple
can I write? can you write? can she write? can we write? can you write? can they write?
Forma con V-ing
can I be writing? can you be writing? can she be writing? can we be writing? can you be writing? can they be writing?
Perfecto
can I have written? can you have written? can she have written? can we have written? can you have written? can they have written?
Perfecto con V-ing
can I have been writing? can you have been writing? can she have been writing? can we have been writing? can you have been writing? can they have been writing?
Forma interro-negativa
Forma simple
can't I write? can't you write? can't she write? can't we write? can't you write? can't they write?
Forma con V-ing
can't I be writing? can't you be writing? can't she be writing? can't we be writing? can't you be writing? can't they be writing?
Perfecto
can't I have written? can't you have written? can't she have written? can't we have written? can't you have written? can't they have written?
Perfecto con V-ing
can't I have been writing? can't you have been writing? can't she have been writing? can't we have been writing? can't you have been writing? can't they have been writing?