從賴氏英文文法書上看到這兩句句子

I am sorry that I cannnot attend your party.

I am not sure whether he'll come.

書上是說，名詞子句亦可置於形容詞之後，此時即成副詞子句，修飾該形容詞
that I cannnot attend your party 當副詞子句，修飾 sorry(adj)
whether he'll come 當副詞子句，修飾 sure(adj)

這種說法我無法理解，我看他長的就一副名詞子句樣，

1.that(無義)+直述句

2.whether(是否)<-yes/no question 改造而來(尤其還出現will)

怎麼會變副詞子句去，所以找了其他2種解釋

1.

I am sorry (about) that I cannot attend your party.

that I cannot attend your party當成已經省略介係詞about的受詞

所以屬於名詞子句，具有名詞類特性。

類似還有
I am sorry (about) that Tom should be so weak.
I am glad (at) that you've made it.
She is thankful (of) that her problem has been solved through your help.

第二句sure同上，I am not sure (of) ~~~~~


2.旋元佑用同位格去解釋

EX
I am afraid that I can't help you.

還原
1.I am afraid of that thing.
2.I can't help you.

->That thing是空洞的名詞，無義
->That thing的內容就是 that I can't help you 重複
->Of that thing 是可有有無的介係詞片語

合併造出->I am afraid that I can't help you.

that I can't help you屬名詞子句，是that thing的同位格概念

第二句sure同上I am not sure (of) that~~~~~


這兩種解釋我都能接受且理解，想問一下這種解釋有無問題????

另外"純that"是否能當副詞子句的連接詞?????

而此時這個"純that"代表的意思是啥?????
(副詞子句連接詞都該有義)


因為有看到當表結果 目的時可以用that當副詞子句的連結詞這說法，

但我去分析那些舉例的句子，that都是像

so~~~~~that~~~~(前面根本有個so)
in order that(in order省略 留下that)
so that (so省略 留下that)

沒有純that的句子，
是否表示只有名詞子句才有 that(無義)+直述句，
副詞子句則無 that(???)+直述句???

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