To walk from Tian' anmen Square to the Summer Palace is too far.(改为同义句)
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To walk from Tian' anmen Square to the Summer Palace is too far.
= It is too far to walk from Tian' anmen Square to the Summer Palace.
注:变化句型采用It做形式主语,而不定式短语to walk from Tian' anmen Square to the Summer Palace放在句尾做真正的主语.