The particles さえ, すら, and だに are often interchangeable, but pay close attention to detail. There is some history involved, so try not to use these words anachronistically. Although they're interchangeable with each other, there are subtle differences.
すら is the original particle for minimal example--"even...not to mention..". Now it has evolved to show minimal expectation, which is showing an extreme (usually negative) example. So, it is equal to "(not) even". It can be seen as ですら. すら is faded into literature and somehow survived to the present. Now, だに is ironically rarer than すら.
Using this with other particles is very tricky as there is historical and personal variation. For instance, using it with を isn't wrong. However, many people just use すら. For when you do want to use it with を, をすら and すらを are both possible, but the latter is extremely old-fashioned. Even so, it still pops up.
Anyhow, although the Metropolitan Police themselves having been leaking out general people's criminal record data has just become a problem, it's because they even rejected a public court's official decision.
From 明日はどっちだ! by 岡留安則.
さえ comes from the verb 添ふ (to add), which has become 添える in Modern Japanese. So, the original meaning of this particle was "in addition to". Eventually, さえ began to be used to show minimal example. Both usages survive today, but the latter can be alternatively expressed with でさえ, as is demonstrated in the example below. It is to note that both ですら and でさえ are only used after nouns! This is because the case particle で is in these expressions.
These days even boys in elementary school know.
The meaning of X(で)さえY is this. Some X matter and some Y action/happening/condition are usually not connected in any one, yet when you bind them together, you emphasize a situation that is not the norm by any means. This is what minimal example means.
Not even a tiger can hurt him.
It's sometimes hard to tell which meaning is meant. Minimal example is often used in negative expressions, but when this is not the case, consider the context. "Even a kid can understand it" is minimum example. "In addition to us, even the dogs understand" shows addition. It doesn't help that both English and Japanese are vague on this.
Not even rain fell, let alone snow.
It's something even a beginner can do.
Even kids know that.
Even under normal circumstances, hanging out along the way even when the train is late is just...
Because I'm all alone, you're the only thing my heart relies on.
1. さえ can be after other particles like に. をさえ is also possible, but を is usually dropped. In literature, however, をさえ is more common.
Even though I was keeping it a secret, it was even found out by a three year old.
I was able to have the realization that I myself was still alive.
From 光の雨 by 立松和平.
2. There is also さえも and さえもが. Both are more emphatic than さえ and show minimal example, but が implies new information and or surprise. If you understand も and が well enough, this shouldn't be hard to visualize.
Even death was something which would be bring ease to Tamai.
From 光の雨 by 立松和平.
Both さえ and すら can be after the 連用形 of verbs similar to は, や. etc. You can also use them after て. This creates a phrase that puts emphasis on the action rather than the noun. すら, again, is increasingly becoming rarer, so you will probably only see it with nouns. Here is a chart using the pattern さえ…ば (if only you~) to illustrate this grammar.
|Noun + さえ ＋ Verb ＋ ば||薬さえ飲めば||If you only drank this medicine (and no other)|
|Verb (連用形) + さえ ＋ すれば||薬を飲みさえすれば||If you only drink this medicine (and do nothing else)|
|Verb ＋ て ＋ さえ ＋ いれば||薬を飲んでさえいれば||If you are drinking this medicine (and doing nothing else)|
Grammar Note: Verb＋ている＋さえすれば → Verb＋ていさえすれば. In this case, it doesn't matter that 連用形 of いる is left like that. Remember, this is not like ～ており、・・・.
If you would only not eat, you would be able to lose more weight.
I don't care so long as you are happy.
16. 知ってさえいればな～。(Colloquial Spelling)
If only I had known!
If only I had time, I'd help.
If you just live on, you won't need anything.
If you just study, you should be able to do the exam.
If you just try with all your hardest, you should be able to do anything you like.
If you simply look up Kanji you don't understand, you'll understand them.
If you just try talking to Japanese people everyday, you'll become able to speak in Japanese.
If you drink just this herbal medicine, your sickness should become better.
If I read just Japanese books, I'm happy.
If we only had this, we'd need nothing later.
Nuance Note: Again, these particles emphasize what they directly follow, so although there is some levity on where to place さえ in a sentence, be aware of this.
Speech Style Note: Though さえ may be used in the spoken language, it is more common in the written language.
But, remembering about going onto university brought on annoying circumstances by just remembering.
From 金閣寺 by 三島由紀夫.
Grammar Note: さえ also rarely follows the 連体形 of verbs. This is essentially old-fashioned.
だに, not to be confused with the noun ダニ (tick), is used in both negative and positive sentences. It raises the most probable thing and negates it and anything aside from it. Originally, it showed minimal desire or want. In this sense it means "at the least". This led to it being used to show minimal example just like さえ and すら. This is equivalent to だけで. It is the rarest of the three.
I have not thought of something in just a dream.
The neon lights complicated things, and the bar's big, red lantern didn't even sway a bit.
From スタア by 三島由紀夫.
Grammar Note: だも is a contraction of だにも.