Scales

When singing scales. How do you know what the next note will be when moving up pitch 

Hi, George! Most of the time, we're using the major scale, which has a repeated pattern of whole steps and half steps: W-W-H-W-W-W-H. Once you're familiar with that pattern, it becomes easier to anticipate! Here is an hourlong lesson on music theory for beginning singers, which covers this and more: https://youtu.be/xp8FVRqu7Zk. Hope it helps!