Which are correct:
1) This is a machine which it is easy to cause to malfunction.
2) This is a machine which is easy to cause to malfunction.
3) This is a machine easy to cause to malfunction.
4) This machine is easy to cause to malfunction.
The idea is simple, but expressing it seems difficult to me because we have two verbs in the adjectival clause. They all sound a bit strange to me!
It is easy to cause this machine to malfunction.
Gratefully,
Navi
