They were kissing passionately.是什么意思？

They were kissing passionately.

他们在热情地接吻。

they

pron. 他/她/它们，人们，大家，政府，当局，她们；

例句
The storms had abated by the time they rounded Cape Horn.
他们绕过合恩角时，暴风雨已经减弱。

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

例句
Shops, houses, and vehicles were set ablaze.
店铺、房子和车辆全都陷于火海。

kissing

adj. 接吻的；n. 开压边（内）浇口；v. 吻( kiss的现在分词 )，轻拂，轻触；

例句
The two of them finished by kissing each other goodbye...
他们两人最后互相吻别。

passionately

adv. 热情地，激昂地；

例句
He passionately championed the poor...
他满腔热情地捍卫穷人的利益。