SpiritualAtheist wrote:
Recently scientists learned about the changes in earth that had happened during the last ice age
Correct sentence : Recently scientists learned about the changes in earth that happened during the last ice age
Can someone please explain why the occurrence of events 'learning about the changes' and 'happening of changes' do not impact each other -- hence, the use of 'had happened', i.e past perfect, is incorrect here --
Past perfect is used to describe an event that happened earlier than before.
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