не мог помочь

couldn't help

→ не
phrase Common #10,027
couldn't help Used for a male subject in the past. In the examples, the verb appears in other forms meaning “can't help.”
RU: Он не мог помочь мне.
EN: He couldn't help me.

Том не мог помочь?

Couldn’t Tom help?

Том не мог помочь Мэри.

Tom couldn't help Mary.

Том ничем не мог помочь Мэри.

Tom couldn't help Mary in any way.

Я ничем не мог помочь Тому.

There was nothing I could do to help Tom.