//要求動詞のthat以下は動詞の原形
He requires that bills be paid by then.

//advice,demand,desire,insist,propose,orderは仮定法現在なのでthat以下は原形
he proposed that the convention be held in Chicago.

//先行詞に最上級、序数詞がくる場合、関係詞はthatか省略、whomじゃない
She is the most beautiful woman that I have ever seen.

//先行詞にthe only,the same,the very,every,allが付いている場合はthatを使う
She is the only person that can speak English.

//条件を表す副詞節は現在形（名詞句は違う）
I will start when he comes.　　　　　SV
I don't know when he will come.　　 SVO