名詞從句作動詞賓語時，前面的that常被省略，特別是在非正式語體中：

I suggested (that) they should drive along the coast. 我建議他們沿著海岸開車。

I hoped (that) I would / should succeed. 我曾希望我會成功。

I know (that) he will be in time. 我知道他會趕得上的。

I knew (that) he would be in time. 我當時知道他會趕得上的。

He thinks (that) they will give him a visa. 他想他們會給他簽證。

He thought (that) they would give him 3 visa. 他本想他們會給他簽證。

I expect (that) the plane will he diverted. 我料想飛機會改變航線。

I expected (that) the plane would be diverted. 我本料想飛機會改變航線。

在某些動詞 (如answer, imply) 之后則一般需要用that。如：

He answered that he was from Austria. 他說他是奧地利人。

She answered that she preferred to eat alone. 她回答說她愿意獨自吃。

I don’t wish to imply that you are wrong. 我無意暗示你錯了。

The newspapers have implied that they are having an affair. 報紙報道暗指他們有染。

在較長的句子里，特別在“that從句”與動詞隔開時，that一般不可省略。如：

The dealer told me how much he was prepared to pay for my car and that f could have the money without delay. 那個商人告訴我他準備出多少錢買我的汽車，并說我會立即收到款。