1-if it is his favorite subject and he works a lot at it,he'll always gets top marks in mathematics
2- if it were his favorite subject and he worked a lot at it,he would always get top marks in mathematics
3-if it had been his favorite subject and he had worked a lot at it,he would have always got top marks in mathematics
numai o fraza ai? vad cascrie A) xa si cum ar urma si alte fraze.Eu ti-am pus fraza la toate cele 3 posibilitati de if