2週4日目 君さえいれば
Value・ability・condition
接続：N（助詞）＋さえ
even; just
注意 / Note：TWO meanings, distinguished by the following clause. Standing alone is «even» — give an extreme example to infer the rest (子どもでさえ知っている ⇒ adults, of course). With 〜ば it becomes «just» — see 〜さえ〜ば.
比較 / Compare：Same song: 〜さえ〜ば／〜でさえ. These models are often mistakenly chosen for each other — carefully read the 接続 and nuances above and then decide.
よく出る形 / Common form：名詞（＋助詞）＋さえ。After a noun referring to PEOPLE usually becomes 〜でさえ. The shade is stronger than 〜も.
子どもでさえ知っている。
Even children know.
水さえあれば生きられる。
As long as there is water, one can live.
忙しくて、食事をする時間さえない。
So busy that I don't even have time to eat.