Student or Learner
Too much water makes plants turning brown on the edges of their leaves.
In this sentence there is a mistake. I think the third one isn't correct because make is a causative verb and we need an infinitive without to. Am I right?
You are right.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.