Question

care e diferenta dintre:
shall & should
can & could ?
explicatie in engleza

Answer 1

A simple explanation is that :
- should is the past tense of shell, and
- could is the past form of can.

Answer 2

The different between ,, can" and ,, could" is that ,, could" is the past tense form of ,, can".
The difference between ,, ,, shall" and ,, should" is that ,, should" is the past tense form of ,, shall". 
In romanian, ,,can" means ,, a putea" and ,, shall"  means ,, ar trebui".