so...that...，such...that...
①so...that...“如此……以至于”，表結果。該結構常見于:so+形容詞/副詞+that；so+形容詞+a(an)+單數名詞+that
②such...that...“如此……以至于”，表結果。該結構常見于：such+ a(an)+形容詞+名詞+that；such+形容詞+復數名詞/不可數名詞+that。
It's so hot that you can fry an egg on the sidewalk.=It's such hot weather that you can fry an egg on the sidewalk.
天如此熱，你能在人行道上煎雞蛋了。

2. It looked as if someone had cut a patch out of the air, about two metres from the edge of the road, a patch roughly square in shape and less than a metre across.
看上去就像有人在距離路邊大約兩米的地方將空間切開了一塊，它大體呈方形，不到一米寬。
(1)句中as if跟在looked之后,引導表語從句,意為“看起來像,看起來似乎”。
She looks as if she were ten years younger.
她看起來比實際年齡年輕10歲。
as if引導的表語從句使用了虛擬語氣，表明是虛擬的、假設的,而非真實情況。
as if從句若用陳述語氣，是為了表示說話人僅僅把從句中所說的內容當作真實的情況看待，使人覺得它是事實。
It seems as if it is going to rain.
看起來天要下雨了。
(2) less than“少于”后面常跟數詞。