I unserstand that. I have more issues later on with Future perfect "ele terá feito isso quando ela dormir" he will have done that when she fell asleep or when she sleeps the difficult is why is the dormir verb in infinitive and not like "quando ela ficou dormida" any sugestions?
That's because it's the future subjunctive. It looks just like the infinitive, but it's not.
The future subjunctive can be easily recognized by the presence of "quando".
Most tables bring those conjugations exaclty like this:
- Quando eu dormir
- Quando tu dormires
- Quando ele/ela dormir