when

[navi tasan]

Which are correct:

1-We went to the same dance school so there is some similarity between when I dance and when he does.
2-We went to the same dance school so you might notice some similarity between when I dance and when he does.

3-We went to the same dance school so when I dance and when he does, there is some simirlarity.
4-We went to the same dance school so when I dance and when he does you might notice some simirlarity.

[5jj]

3-We went to the same dance school, so there is some simirlarity when I dance and when he does,
4-We went to the same dance school, so you might notice some simirlarity when I dance and when he does.

#1 and #2 would mean that there is a similarity in the times of our dancing - highly unlikely.

#3 and #4 are possible but with the word order I have suggested. More natural still would be:

We went to the same dance school, so you might notoce some similarity in our dancing styles / in the way we dance.

[Tdol]

2-We went to the same dance school so you might notice some similarity between when I dance and when he does.

I think this would sound better like this:

2-We went to the same dance school so you might notice some similarity/similarities when we dance.

[Rover_KE]

Please give more helpful titles, navi, such as We went to the same dance school. We don't charge by the word.

When tells us nothing.

Rover