２人のうちどちらかが行かねばならない。の英語

Either of the two must go.

One of the two has to go.

We must judge between two applicants.

Can they ever overcome this problem?

It takes two to make a quarrel.

Why don't we go somewhere together?

They repel each other.

The two men argue about what they should do.

Two's company, but three's a crowd.

Two's company, three's a crowd.

They are very supportive.

Are both of you ready to go?

I don't know either [I know neither] of them.

They don't get on [along] well with each other.

Things are not going very well between them.

Their happy marriage was the envy of all their friends.

two people considered as a unit

singly or in pairs

It seems those two are made for each other.

It seems the two are made for each other.

It seems that those two are made for each other.

Make sure of two seats.

They are in love with each other.

They are lovers [sweethearts].

He is the more diligent of the two.

Those two don't seem to get on with each other [to hit it off very well].

I don't think there's much to choose between the two.

It is very difficult to say which of the two is better.

They join forces.

You are both in the wrong.