due to は「〜が原因で」を表す
要点文法の意味
due to は、名詞（句）を続けて出来事の原因を表す表現
because とは違い、後ろに主語＋動詞の文（節）は続けられません。
文法の形
文頭、be動詞の後ろ、文末などいろいろな位置に置けます。
形
due to + 名詞（句）
The delay was due to heavy snow.
文法のルール
1
due to の後ろは名詞（句）だけ。主語＋動詞の文は続けられない。
The game was canceled due to it was raining.
The game was canceled due to the rain.
due to の後ろは名詞（句）だけです。it was raining のような文（節）は続けられません。
2
due to だけで「〜が原因で」を表す。of は付けない。
Due to of the traffic, we were late.
Due to the traffic, we were late.
due to だけで「〜が原因で」を表すので、後ろに of は付けません。