so..that..是固定用法,意為：“如此.以至于.”
如果單獨(dú)看that的話,它就是一個(gè)普通的連接詞.去掉so可以嗎可以的the book is nice that is what i want（to buy）這個(gè)句子正確嗎？不正確，要在that之前加一個(gè)and就對(duì)了the book is nice andthat is what i want（to buy）.the book which is nice is i want（to buy）the book which is nice that is what i want（to buy）這兩個(gè)句子怎么分析呢？哪個(gè)對(duì)？?jī)删湓挾疾徽_。第一句：the book which is nice is i want（to buy） 這句話你用which引導(dǎo)一個(gè)定語(yǔ)從句修飾book，這兒沒錯(cuò)。錯(cuò)的在后面，the book which is nice is后面連接的是表語(yǔ)從句，缺少一個(gè)詞來(lái)引導(dǎo)這個(gè)表語(yǔ)從句，所以要加個(gè)what。the book which is nice is what i want（to buy）第二句：根據(jù)我對(duì)第一句的分析，很容易發(fā)現(xiàn)這句多了一個(gè)連接詞that，刪去就行了。