Question

Verbo can no passando quando é negativa e couldn't interrogativa could e na afirmativa?

Answer 1

Could : verbo no passado afirmativa

I could run very fast when young

Could not/ couldn't negativa no passado

I could not pass the exam last week

Could you? Interregativa no passado

Could you listen to the teacher despite the noises?

Answer 2

The verb can, as a modal verb, is invariable for all persons in present. Take a look:

I can;

you can;

he/she/it can;

we can;

you can;

they can