疑问词可用 how 加表示经常的副词 often。 如果句子含义 be,应该用 “How often+ be+主语+ ...”,如 How often is he out at night (他晚上多久出去一次)? 如果句子的谓语动词是行为动词,应该用 “How often does/did+主语+...”,如 How often does he leave on business (他多长时间出差一次)?
疑问词可用 how 加表示经常的副词 often。 如果句子含义 be,应该用 “How often+ be+主语+ ...”,如 How often is he out at night (他晚上多久出去一次)? 如果句子的谓语动词是行为动词,应该用 “How often does/did+主语+...”,如 How often does he leave on business (他多长时间出差一次)?