有时候，最重要的或者最年长的客人没有坐下的话，别的客人往往不肯坐下。

有时候，最重要的或者最年长的客人没有坐下的话，别的客人往往不肯坐下。

Results (English) 1:

Sometimes, when the most important or the oldest guests do not sit down, other guests often refuse to sit down.

Results (English) 2:

Sometimes, the most important or oldest guests don't sit down, and other guests often refuse to sit down.

Results (English) 3:

Sometimes, if the most important or oldest guest doesn't sit down, other guests often refuse to sit down.