由于用餐人数较多，餐位有限，建议尽早预定。(It)

It is recommended to make a reservation as early as possible because there are a large number of diners and the number of dining seats is limited.

考查动词、名词和形容词。根据句意可知，这里时态应用一般现在时表客观情况。表示 “建议” 可用it is recommended to，为固定句型，其中it为形式主语，后面不定式为逻辑主语；表示 “预定” 应用make a reservation；表示 “尽早” 应用as early as possible，在本句中作状语；表示 “由于” 应用because，引导原因状语从句；表示 “用餐人数较多” 应用there are a large number of diners，为there be句型；表示 “餐位有限” 应用the number of dining seats is limited，为主系表结构。故翻译为：“It is recommended to make a reservation as early as possible because there are a large number of diners and the number of dining seats is limited.”。