N4 — outside your level filter

it is X that — the sentence is rebuilt so one part of it lands at the end as the answer

彼かれに初はじめて会あったのは、去年きょねんの夏なつでした。

kare ni hajimete atta no wa, kyonen no natsu deshita.

It was the summer of last year that I first met him. neutral

今いまいちばん食たべたいのは、やっぱりラーメンかな。

ima ichiban tabetai no wa, yappari raamen kana.

What I want to eat most right now is ramen, I think. casual

Variants

のがnogaalternant
が in place of は where the focus is picked out of a set rather than contrasted — 今回こんかい特とくによかったのが、この曲きょくです.

のは〜だ

のは〜だno wa daN4neutral