I realized we had a lot in common.
→우리가 잘통하는것을 깨달았어.

※ have in common :공통점이 있다.

〔예문〕
When I spoke to Carl,I realized we had a lot in common..
내가 칼과 얘기를 나누었을때,우리가 잘통하는것을 깨달았어.

Lee and his wife have very little in common but have been married for over ten years.
리와 그의 아내는 공통점이 거의없지만 10년동안 함께 살아왔다.

The date was awful;we had nothing in common.
데이트는 끔찍했어,통하는게 하나도 없었거든.