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Science - Coggle Diagram
Science
Galileo invented the telescope. He discovered that the Earth wasn't the centre of the universe. 
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Isaac Newton
Newton was visiting his mother and was walking around in her garden, when he sat down under a tree and started thinking. While he was sitting, an apple fell out of the tree.
:spiral_note_pad: We use past simple for an action that happened at a particular moment in the past, often with when.
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:spiral_note_pad: We use past continuous for a background action, often with while.
While Benjamin Franklin was watching a thunderstorm, he got some ideas about electricity.
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Inventions
If we didn't have electricity, life would be a lot more difficult.
:spiral_note_pad:We use the second conditional to talk about the consequences of an unreal present action or an improbable future action.
:spiral_note_pad: We use past simple in the condition (if) clause; and would + verb in the result clause.
If I won the lottery, I'd buy a yacht.
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