搞曖昧 的英文怎麼說?

[1] They seem very close.[2] There seems to be chemistry/sparks between them.[3] They are always flirting with each other when they are together.

指一對男女關係不明不過互有好感. 這類說法相當多, 用簡單的說法就可以表示. [1]跟[2]就是他們看起來在搞曖昧. [3]就是當他們在一起時常常調情.