Rough-in composition

[miked17]

Picture attached.

DIY framing my basement and most likely hiring a professional plumber for the washroom.

The 4" pipe in the front I'm sure is the toilet drain. Pipes to the back right must be the vent stack right? With an elbow for a future sink? Thankfully it's positioned perfectly to sit inside the wall with > 12.5" to the center of the toilet drain

Is the one in the back left a shower drain? Seems like a weird spot for it?

 

[hj]

The left pipe, since it is 1 1/2" is probably the tub vent and the pipe to the left of it is the trap, but you would have to check it visually to be sure. If so, then the far left pipe may be for a laundry sink or similar.