1. 表特指
所謂表特指，就是說此時的what 在用法上大致相當於the。如：
what money i have will be yours when i die. = the money i have will be yours when i die. 我一死我的錢就都給你。
what possessions i have are yours.=the possessions i have are yours. 我的所有的財產都是你的。
2. 表“微量”
有時不僅表特指，而且還表“微量”，即含有“量不多”之意。如果將“特指”和“微量”結合起來，該結構的意思就是“雖不多，但全部”，有時可譯爲“僅有”。如：
what ideas he has are his wife’s. 他僅有的一點想法都是他妻子的。
what friends she has are out of the country. 她有的那些朋友全在國外。
這類“what+名詞”結構並不是總具有“微量性”，即有時有，有時沒有。如果要想明確或強化這種微量性特點，我們可以該結構的名詞前加上表示微量的修飾語few(用於複數名詞前)或little(用於不可數名詞前)。如：
what few friends she has are out of the country.=the few friends she has are out of the country. 她僅有的幾個朋友都在國外。
what little free time he had was spent with the family.= the little free time he had was spent with the family. 他僅有的一點空餘時間都是與家人在一起度過的。
, whom, that一起用
這些詞代替的先行詞是人的名詞或代詞，在從句中所起作用如下：
Is he the man who/that wants to see you?
他就是想見你的人嗎？（who/that在從句中作主語）
He is the man whom/ that I saw yesterday.
他就是我昨天見的`那個人。（whom/that在從句中作賓語）
4. Whose 用來指人或物，(只用作定語, 若指物，它還可以同of which互換）, 例如：
They rushed over to help the man whose car had broken down. 那人車壞了，大家都跑過去幫忙，英語語法《關係代詞引導的定語從句》。
Please pass me the book whose (of which) cover is green. 請遞給我那本綠皮的書。
h, that它們所代替的先行詞是事物的名詞或代詞，在從句中可作主語、賓語等;
例如
A prosperity which / that had never been seen before appears in the countryside. 農村出現了前所未有的繁榮。（which / that在句中作賓語）
The package (which / that) you are carrying is about to come unwrapped. 你拿的包快散了。(which / that在句中作賓語）
