What to choose in or into and why?
The burglars broke in/into the house by smashing the window. (enter by force)
P.S.: You could also have a look at the picture with this question. http://i.piccy.info/i9/b554b11c5ceb4f9feb454855b1b6f053/1543738113/18425/1271340/Screenshot_4.png
I know that break in means to enter a place by using force in order to steal sth and break into means to enter a specified place by using force in order to steal sth
sth - short for something.
Taken from Virginia Evans Jenny Dooley - On Screen B2