One level, two liters, three turns and four drops.

Second, the standard key signature formula:

Mark's key signature, looking for mom A, mom A doesn't look for oe, iu is tied behind.

Third, the formula of jqx and ü spelling:

When Xiao ü saw jqx, she wiped her tears and smiled.

Xiao ü left jqx and cried. Fourth, the overall recognition of syllables forming children's songs:

Aoe, you can go out alone when you grow up.

Iuü, not a big boy, needs his parents to take him out and sometimes hides.

Five, single rhyme formula song:

Open your mouth and the rooster crows.

The reflection of goose e e e e e, button coat ii i.

The crow's home is u u u, and the small fish spit.