Grammar fix

let alone

much less (emphasising something is even less likely or possible)

Used after a negative statement to emphasise that if the first thing isn’t true or possible, then the second thing is even less likely or possible.

expressionC1common

Hear it in context

Notice where the phrase sounds natural.

Most teenagers can’t afford to buy a car, let alone a house.daily life
Honestly, I barely have time to cook for myself these days, let alone try out new recipes or bake something special. My schedule is just too packed.IELTS speaking

Pattern: [negative clause], let alone [more extreme/less likely thing]

WrongHe can't walk, let alone to run.

RightHe can't walk, let alone run.

'Let alone' is followed by the same form as before it — here a bare verb ('walk... run'), no 'to'.

Pattern[negative clause], let alone [more extreme/less likely thing]

Choose the version that sounds natural in speech.

Stiff I cannot afford a modest car, and certainly not a luxury vehicle.

Natural I can't afford a basic car, let alone a luxury one.

'Let alone' links the two in one move; the formal version repeats the whole structure.

Words that usually travel with it.

'Let alone' is stronger and more emphatic than 'not to mention', and is only used after a negative or limiting statement.