I can require you can require he can require we can require you can require they can require
Forma con V-ing
I can be requiring you can be requiring he can be requiring we can be requiring you can be requiring they can be requiring
Perfecto
I can have required you can have required he can have required we can have required you can have required they can have required
Perfecto con V-ing
I can have been requiring you can have been requiring he can have been requiring we can have been requiring you can have been requiring they can have been requiring
Negación
Forma simple
I can't require you can't require he can't require we can't require you can't require they can't require
Forma con V-ing
I can't be requiring you can't be requiring he can't be requiring we can't be requiring you can't be requiring they can't be requiring
Perfecto
I can't have required you can't have required he can't have required we can't have required you can't have required they can't have required
Perfecto con V-ing
I can't have been requiring you can't have been requiring he can't have been requiring we can't have been requiring you can't have been requiring they can't have been requiring
Forma interrogativa
Forma simple
can I require? can you require? can he require? can we require? can you require? can they require?
Forma con V-ing
can I be requiring? can you be requiring? can he be requiring? can we be requiring? can you be requiring? can they be requiring?
Perfecto
can I have required? can you have required? can he have required? can we have required? can you have required? can they have required?
Perfecto con V-ing
can I have been requiring? can you have been requiring? can he have been requiring? can we have been requiring? can you have been requiring? can they have been requiring?
Forma interro-negativa
Forma simple
can't I require? can't you require? can't he require? can't we require? can't you require? can't they require?
Forma con V-ing
can't I be requiring? can't you be requiring? can't he be requiring? can't we be requiring? can't you be requiring? can't they be requiring?
Perfecto
can't I have required? can't you have required? can't he have required? can't we have required? can't you have required? can't they have required?
Perfecto con V-ing
can't I have been requiring? can't you have been requiring? can't he have been requiring? can't we have been requiring? can't you have been requiring? can't they have been requiring?