I have been trying to figure out some ways on how to resolve the following clipper circuit , but I got confused with the diode which is not in the same line with the resistor ?
And also both difference potentials are positive . Does this mean the circuit cuts the the signal only through its positive half wave ?
Thanks and have a nice day!

 

The input is apparently not AC since the inputs are labeled VI+ and VI-.

Break the down into parts.

Assume all of the diodes are ideal and have no forward voltage drop.

Looking at the way D1 is connected, is there any way the output voltage can be negative?

Look at the 20 volt bater and 100k. If the anode of D1 is at ground, what is the voltage on at the output?

Look at the 50k resistor, D2, and the 80 volt battery -what is the maximum voltage that can appear on the anode of D1?

What happens to the ratio of input voltage to output voltage when the input is between 20 and 80 volts?

I think the answers to those questions will allow you to sketch the output waveform for an input from - infinity to + infinity.