He started learning English when he was 10.(改为同义句）
问题描述：
He started learning English when he was 10.(改为同义句）
答
He has started learning English since he was 10.
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答
He started learning English at the age of ten.
解析:at the age of 在...岁时
答
He started ___ English ___ ___ ___ ___ three. learning when he was only
答
He started to learn English when he was 10
答
He has been learning English since he was 10/ since the age of 10
He has learnt English since he was 10./ since the age of 10.