1.

Bass tenor

-soprano.-contralto

The advantage of this is that the two external parts are close together, which ensures the sound framework of the chorus; These two endogenous parts are closely combined to achieve the maximum harmony.

2.

-Tall.-Short-

-Female height-Female height-

The advantage of this is to highlight the cooperative relationship between the high-pitched part and the low-pitched part, but the disadvantage is that the internal sounds are far apart.

3.

-Low man-Tall man-

-Women are low-

-Female height-

The advantage of this kind is that the melody is prominent, and the male part can sink behind.

In addition, if there is a piano accompaniment, the piano is usually placed on the left side of the chorus.

Note: All formations need to stand in an arc.

That's all. I hope it works for you.