Question

مجبور به استعفا شد.

استعفا داد.

Answer 1

S/He was forced to resign. 

S/He had to resign.

S/He was left with no choice but to resign.

برای دومی :

S/He resigned.

S/He submitted her / his resignation.

البته برای دومی یک حالت دیگر هم هست به مفهوم کناره گیری کردن از مقام یا مسئولیت های رسمی با فعل زیر :

to abdicate

https://www.google.com/url?sa=t&source=web&rct=j&url=https://dictionary.cambridge.org/amp/english/abdicate&ved=2ahUKEwjz9tmW8qvoAhVEC-wKHSE4CS0QFjAKegQIARAB&usg=AOvVaw35zdAmohSDWvRixg4MYMBh&cf=1