Explanation
Expresses two possibilities; 'either A or B', 'whether A or B'.
Formation
Noun + とも + Noun + とも (or sometimes Verb forms for each A, B)
Detailed explanation
The 'A とも B とも' grammar pattern indicates two possible scenarios. It can be translated as 'whether A or B' or 'either A or B'.
Examples
Ketsudan tomo ayamari tomo, kekka wa jikan ga oshiete kureru deshou.
Whether it's a wise decision or a mistake, time will show the result.
Kare wa chichi tomo ani tomo, mou nannen mo hanashite inai.
He hasn't spoken to either his father or his brother in years.
Kanojo tomo tomodachi tomo eiga o mi ni iku tsumori desu.
I plan to go watch a movie either with my girlfriend or a friend.
Kono geemu ni wa jikan tomo doryoku tomo ienai hodo no konki ga hitsuyou desu.
This game requires a kind of persistence beyond just time or effort.
Practice
Grammar content sourced from hanabira.org.