He started to learn English when he was 12 years old.(保持原句意思

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He started to learn English when he was 12 years old.(保持原句意思）
He__start to learn English __he was 12 years old
2.Without rain,the living things will be all dead.(保持原句意思)
If___ ___ no rain ,the living things will be all dead

很高兴能够在这里回答你的问题：
He started to learn English when he was 12 years old.(保持原句意思）
He　（didn't）start to learn English (untill) he was 12 years old
not untill 句型
2.Without rain,the living things will be all dead.(保持原句意思)
If　（there is）no rain ,the living things will be all dead

He started to learn English when he was 12 years old.(保持原句意思 He began to learn English when he was four years old(同义句) He 改为同义句：He began to learn english when he was six years old. He started to learn the piano when he was five years old. He started to learn the piano when he was five years old(改为同 He started to learn English when he was 3.(改为同义句） He started to learn English when he was three（改为同一句） he began ro learn English when he was six years old.改为同义句 He started learning English when he was three years old.(改写同 He started swimming when he was four years old .(同义句) He sta she started to learn english when she was six years old(改为同义 he started swim when he was four years old