Student or Learner
Hi, is it common?
for example: My friend got stabbed last night, but he was just injured lightly he is back home"
Also, in this case, it's more colloquial to say, " ... he was only slightly injured."
You can't tack a whole sentence "He is back home" onto the m ain sentence like that. You could use a semicolon, but better a new sentence.
"My friend was stabbed last night but, since he was only slightly injured, he is already back at home."