1. In the past people didn't use as much energy as they do now
=> Now people use less energy than in the past.
2 What types of energy sources will people use in the future? =
>What types of energy will be used in the future?
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Giải thích:
1, Less là dạng so sánh hơn của little
2, Câu bị động tương lai đơn: S + will be + V3 (+ by Sb/ O)