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JLPT N1Mostly writtenArguing a point

まして・ましてやlet alone; still less; all the more

If it is hard even for adults, it is harder still for a child, and まして opens the statement that says so. Where that statement rules something out, English has "let alone" or "still less"; otherwise, "all the more".

How to form it

A も/でも/さえ〜。 まして B は〜。

After a period, or part-way through one sentence: A でも〜のだから、まして B は〜. English can stop at "let alone for a child"; Japanese goes on to finish the statement. ましてや is the same with more force.

Before it
A case with も, でも, さえ or すら, "even": the one where you would least expect it.
After it
Often はずがない or わけがない, "couldn't possibly", or なおさらだ, "all the more so".
Where you'll meet it
Essays, editorials, speeches, novels, and anyone arguing a point. In everyday talk people often say なおさら: 子こどもならなおさら無む理りだ.

In use

What goes without saying comes last

English "let alone" works the same way. はおろか and どころか turn it around.

He can't even read hiragana, let alone kanji.

Kanji goes without saying. It comes last, in a statement of its own.

He can't even read hiragana, let alone kanji.

With はおろか, kanji comes first.

Close neighbours

はおろかN1

Written and dismayed, inside one sentence. It follows a noun.

どころかN2

What people say for the same thing, inside one sentence. Its other job is "far from".

にもましてN1

After a noun, a comparison: "even more than".

Check yourself

1Which one makes sense?

Choose an answer to see why.

2Which one fits?

先せん生せいにも解とけない問もん題だいだ。(  )私わたしに解とけるはずがない。

Choose an answer to see why.

More detail

まして comes from 増ます, "to increase": "more so". The same word is in にもまして.

After a verb stem, まして is something else: the て-form of ます, in very polite speech, as in 遅おそくなりまして、申もうし訳わけございません.

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