keep the door open to let fresh air in.分析句子结构

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keepthedooropentoletfreshairin.分析句子结构keepthedooropentoletfreshairin.分析句子结构keepthedooropentoletfresha

keep the door open to let fresh air in.分析句子结构
keep the door open to let fresh air in.分析句子结构

keep the door open to let fresh air in.分析句子结构
祈使句,省略了主语you.to let fresh air in 不定式作目的状语.keep sth done 是固定用法,使门保持开着的状态.

keep作谓语,the door是宾语,open是宾语补足语,to let fresh air in 是不定式作目的状语。