“教室里一定有人，因为灯亮着。”用英语怎么说。

Question

如题所述

Answer 1

there must be someone in the classroom,because the lights are on

Answer 2

There must be someone in classroom because lights are lighting

Answer 3

must be someone in the class,because the light is working

Answer 4

theremustbesomeonejintheclassroombecausethelightison