For example, there is a group of five who get along well with each other and one of their members isn't there, maybe it would be sneaky to talk about that absent member behind her back.
ご質問ありがとうございます。
"Women like to form groups."＝「女性はグループを作りたがる。」
"For example, there is a group of five who get along well with each other"＝「例えば、仲良しの5人グループがあり」
"and one of their members isn't there,"＝「その中の一人がその場に居ない」
"maybe it would be sneaky to talk about that absent member behind her back."＝「その不在の彼女について話すのは卑怯かもしれない。」
ご参考に。
ご質問ありがとうございます。
「グループを作る」はform groupまたはmake groupです。一般的に話すときに大体複数形を使っていますので、上記にgroupがgroupsになっています。例えば、犬が好きなときにI like dogじゃなくて、I like dogsです。
例文：Women like to form groups. For example, if one member of a group of 5 isn't there, it's rude to talk about her.
ご参考になれば幸いです。
アメリカ合衆国 
