主語從句中時態的問題

主語從句中 時態問題 比如

1、It seems that he was right.

1/這對嗎？主句是一般時，主語從句可以是一般過去時嗎？

2/that he was right. 可否看成是表語從句？

2、 It has turned out that he was right. 對

It has turned out that he is right. 錯

第一句對，第二句錯，是嗎？



It seems that he was right.正確無誤。其表達的意義為：目前看來他當時是對的。

至于這個that從句是什么從句，語法家也有爭論。

第一種看法覺得that從句是表語從句，但這沒辦法講解it指什么。

第二種看法覺得that是主語從句，it是形式主語。但卻很難講解that從句為何不可以謂語句首，如：That he was right seems.

假如給seems后加個形容詞，如obvious，

It seems obvious that he was rigght. 則that從句無疑為主語從句。

從《劍橋語法》提高主語結構的轉換來看，好像根據主語從句講解更為合理。試比較：

It is believed that he was right. （it為形式主語，that引導主語從句）

He is believed to have been right. （提高主語結構）

It seems that he was right. it為形式主語，that引導主語從句

He seems to have been right. (提高主語結構）

It has turned out that he was right. 對

It has turned out that he is right. 對

從句用過去時，是由于be right與目前無關。用目前時是由于be right在目前依舊有效。