It is about twenty minutes on foot from here to the bank.(同义句转换）
It is about twenty minutes' walk from here to the bank.
Mrs. Green went to the shop.She wanted to buy a skirt at the shop. (合并为一个句子）
Mrs. Green went to the shop to buy a skirt．
1.twenty minutes' walk
2. for a skirt there
1 twenty minutes' walk
2 to buy a skirt
twenty minutes walking
to buy a skit
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