Going from one mode to another requires a relational chord!~ Without this relational chord, the song will sound very stiff when changing to KEY!~Liu Chuan's March Tong and Li Yanliang's books There are ways to modulate!~

3 modulation methods: ① Natural chord modulation: use the natural chords of the two keys as the medium to convert the function of the chord according to the tone level of the new key , entering a chord that clearly belongs to the new key leads to the new key, and uses the closing form to affirm it. ② Changed chord modulation: The most common chord used as a modulation medium is a natural chord in a certain key, and a changed chord in another key, or both keys are changed chords. ③Equal chord transposition: Convert a certain tone or several tones in the same chord to an equal tone to make it a chord in a new key, and continue in the direction of the new key

C-Am- bB-D