What make relationships work in your opinion

Communication.
Good understanding of themselves and their needs which can then allow for compromises and security in the relation.
Ability to accept someone as they are.

Pushing the right buttons in the right order.

Honesty. Genuine feeling. Communication.

Thoughts - As in your first thought when you wake up and your last thought as you drift to sleep 😴

both working all the time and never seeing each other to get fed up.

Communication and love

Fun

Nothing

Love .. along with communication, effort, honesty, trust, etc

Compromise, caring and closeness.

Friendship