请大神帮我翻译一下英文句子的成分。

Question

A supper is usually a light meal and is probably had after a larger dinner has been had in the middle of the day.
一般现在时里夹着过去时又夹着过去完成时。我已经搞不清它们之间的关系了。
大致意思可以了解，但不知道谁修饰谁。

Answer 1

若不是为了飞行，对运动力学感兴趣，就是一家族传统。 主语：Interest in the mechanics of movement 谓语：was 宾语；a family tradition 插入语：if not flight