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let alone是固定的搭配,意思:更不用說；更別提；不打擾；更不必說.alone後面根據實際情況加上其賓語,如賓格代詞或者單復數名詞或者其它詞性.如:
He did not have enough money to have the tire patched up, let alone buy a new
one.
他的錢還不夠補這個輪胎，更別提買個新的了。
We fear no death, let
alone difficulties. 我們死都不怕, 何況困難?
He's the best shot in the world, let
alone in England. 他是世界上最好的射擊手, 更不用說在英國了.

誰知道 Let me have a try at it （讓我試一下） 這句話句子成分 和為什么要用have

Let sb do sth. let跟大部分的單詞不一樣，不能接不定式，而要接動詞原形。
have a try（試一下）跟have a seat （請坐） , have a look（看一下）一樣，是固定搭配

用一般過去時態描述以前發生得一件尷尬的事

I went home by bus. I was reading an interesting book while a voice said to me， "Would you please let me take your seat for a while?" I raised my head and found an old granny standing beside me. She looked very tired. I quickly stood up and said awkwardly，"Sorry， I didn't notice it." The granny just thanked around， I saw all the passengers smiling at me for my good deed.