请问句中的be动词为什么要用原型?Within weeks Matthews was letting it be known that he would appreciate aninvitation to meet the Prime Minister at Downing Street.句中的letting be known that为什么要用be动词原型,还有appreciate

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请问句中的be动词为什么要用原型?
Within weeks Matthews was letting it be known that he would appreciate aninvitation to meet the Prime Minister at Downing Street.
句中的letting be known that为什么要用be动词原型,还有appreciate 在句中是什么呢意思?

let sb.do sth..
欣赏,感激.