Use it when he/she and you ARE in an argument, and you feel like you are going to cry, or when you don't want to talk about it.
Let alone
Use "let" with a verb, and "leave" with an adjective or adverb. For example we say Let him go, and Leave him alone.
I promise not to let you go into the unknown alone.
'let me / leave me alone' are translated 'laisse-moi tranquille' in French.
The French translation for "let alone" is "sans parler de".
You cannot use the computer, period, if the power is off, let alone an instant messenger application.
Leave someone alone means stop pestering somebody. Let someone alone means let somebody be by himself or herself. The two phrases originally meant the same thing, so you will sometimes find either of them meaning to allow someone to be by himself or herself, but that is increasingly unlikely with "Leave me alone." "Let me alone" can also be used with the stop bothering me meaning.
If you need to ask this you shouldn't own let alone be shooting a rifle!
It is usually safe to use lower amperage on appliances, however, unlikely that it will have enough power to operate let alone power on.
If It Don't Concern You Let It Alone - 1908 was released on: USA: 11 November 1908
Not really. It won't have the gearing and it won't let you get aerodynamic enough. Odds are you wouldn't even finish the race, let alone be competitive.
A one-year-old wouldn't have the mental capacity to know what a phone is - let alone use one !