一般的に後に続く動詞 that は、報告動詞 ( say, tell, admit など) と精神的プロセス動詞 ( believe, think, know, hope など) が含まれます。

They said that four million workers stayed at home to protest against the tax.

The survey indicated that 28 per cent would prefer to buy a house through a building society than through a bank.

He knew that something bad had happened.

Do you think that they forgot to pay or that they stole it?

be + 形容詞 + that -clause を使用して、意見や感情を表現します。このように一般的に使用される形容詞には sure, certain, right, important, afraid, pleased, sorry, surprised, worried ます。意味 that 変えずに省略できます。

It ‘s important ( that ) we look at the problem in more detail.

I ‘m sure ( that ) you’ll know a lot of people there.

They were afraid ( that ) we were going to be late.

名詞 + that -節を使用して、意見や感情を表現します。多くの場合、確実性と可能性についてです。報告名詞でもそれを使用 し ます。このように一般的に使用される名詞には belief, fact, hope, idea, possibility, suggestion, statement, claim, comment, argument 。

He is also having intensive treatment in the hope that he will be able to train on Friday.

Dutch police are investigating the possibility that a bomb was planted on the jet.