主語(yǔ)是you,省去了.
(You ）let me tell you a story.
Let謂語(yǔ),me賓語(yǔ).tell you a story 是省略to的動(dòng)詞不定式,做賓語(yǔ)補(bǔ)足語(yǔ).,其中you做tell的間接賓語(yǔ),a story做tell的直接賓語(yǔ).
比如let him sit down.(to) sit down做賓語(yǔ)補(bǔ)足語(yǔ)