seven和eight可以组成什么英语成语?

seven和eight可以组成什么英语成语?
还要two和three可组成什么英语成语?

twos and threes “三三两两” 固定搭配没什么可解释了.
by/in twos and threes 三三两两
in threes and fours 三五成群
at sixes and sevens 乱七八糟
1.They came home from church by twos and threes.
他们三三两两地从教堂回来.
2.They sat in twos and threes on the trim barbered lawn.
他们三三两两地坐在修剪平整的草坪上.
3.They were at sixes and sevens.
他们都处于一知半解的状态.
4.My room is at sixes and sevens.
我的房间乱七八糟.
5.it’s at sixes and sevens.
整个买卖让你弄得乱七八糟.