21.Use the two pieces of information listed in each item to write a logical third conditional sentence. Part of your sentence has been presented to you. a) I believed in climate change. I protested against it. If I hadn't believed b) Industries didn't reduce their carbon emissions. The planet isn't cleaner. If industries had reduced C) I didn't know about the teacher's strike. I didn't join them. d) I bought a motorcycle. I didn't cycle to work. e) I went to the rally.Jesse challenged me to go. if Jesse hadn't challenged me to do it.

## Step 1<br />The problem is asking us to create logical third conditional sentences using the information provided in each item. The third conditional is a conditional sentence that talks about a hypothetical situation in the past and its probable result. The structure of a third conditional sentence is: "If + past perfect, would have + past participle".<br /><br />## Step 2<br />Let's apply this structure to each item:<br /><br />a) If I hadn't believed in climate change, I wouldn't have protested against it.<br /><br />b) If industries had reduced their carbon emissions, the planet would be cleaner.<br /><br />c) If I had known about the teacher's strike, I would have joined them.<br /><br />d) If I hadn't bought a motorcycle, I would have cycled to work.<br /><br />e) If Jesse hadn't challenged me to go, I wouldn't have gone to the rally.