It is so beautiful that we forgot five hours had been past.
“so...that...”的意思是“如此/這麽……以致於……”，常引導結果狀語從句。“so...that...”句型的用法：
“so... that...”句型中的so是副詞，常常用來修飾形容詞或副詞，常用句型為：主語+謂語+so+adj. / adv. + that從句。
例句： ?
1、The boy ran so fast that I couldn't catch him. ?
男孩跑得太快了以致於我追不上他。
2、She is so young that she can't look after herself. ?
她太小了以致於不能照顧自己。
3、He was so angry that he couldn't say a word.
他太生氣了以致於說不出壹句話。
擴展資料：
壹、 so與that也可連起來寫，即變成：... so that ...(以便 / 為了……)，引導目的狀語從句。
例如： ?
1、I got up early so that I could catch the early bus. ?
為了趕上早班車我起得很早。
2、Please open the window so that we can breathe fresh air. ?
請打開窗戶以便我們能呼吸到新鮮空氣。
3、You must go now so that you won't be late.
為了不遲到妳現在必須走了。
二、 在“such... that...”句型中，such修飾名詞，意思也是“如此……以致於……”但當名詞前有many、much等詞修飾時，句子中要用“so...that...”而不用“such...that...”。
例如： ?
1、He has so much money that he can buy what he wanted. ?
他有很多錢以致於他可以買任何他想買的。
2、There is little water in the glass that I can't drink any more. ?
杯子裏只有壹點水以致於我不能再喝了。