YOU SAID:
the lab caught on fire
INTO JAPANESE
ラボは火事に遭った
BACK INTO ENGLISH
The lab was on fire
INTO JAPANESE
ラボは燃えていました
BACK INTO ENGLISH
The lab was burning
INTO JAPANESE
ラボは燃えていました
BACK INTO ENGLISH
The lab was burning
Okay, I get it, you like Translation Party.