18.到了一個(gè)陌生的城市,買一張地圖是很重要的.
When you are in a new city,it's important to buy a map.

分析 it's important to buy.

解答 答案:it's important to buy.結(jié)合句意是說客觀事實(shí)用一般現(xiàn)在時(shí),表示做某事是怎樣的用it's+adj+to do sth,重要的important,buy買,故答案是it's important to buy.

點(diǎn)評(píng) it's+adj(表示事物的性質(zhì)特征的形容詞)+for+sb+to do
這類的形容詞有:
possible,necessary,convenient,difficult,easy 等
It is possible for him to come here
it's+adj(表示人的品質(zhì)特征的形容詞)+of+sb+to do
這類的形容詞有:
kind,nice,wise,foolish,friendly,polie,impolite 等
如:
It is wise of you to do so.

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