The best way to differentiate the verses and the chorus is in the chords and rhythm you use in each part.

So for example.... the verses might start on the 1 chord.... (root) and use the 1, 4, 5, chords in it... and it might have a slow meter to the melody line.

When you enter the chorus, start on the 4 chord and make the melody line a faster meter. Deliver the words with a more rapid feel.... Here's an example: https://www.youtube.com/watch?v=WKSNHcsqqKM Bellamy Bros, Let your love flow. Note the chorus starting on 4 and the different meter between the verses and the chorus.

Essentially you want to make the 2 parts sound like they are different while still retaining the cohesiveness of being one song.

I like to write the chorus in such a way that repeating it fits the different stories told in the verses.... a great example of this is Tim McGraw - Don't Take The Girl. https://www.youtube.com/watch?v=-vn6QdqxK3g

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