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不定式和現(xiàn)在分詞均可用于名詞后作定語，但是有區(qū)別。其中最基本的區(qū)別就是：不定式表示尚未發(fā)生的動(dòng)作，現(xiàn)在分詞表示正在進(jìn)行的動(dòng)。如：

1. Do you know the man who will speak at the meeting tomorrow?

=Do you know the man to speak at the meeting tomorrow?

由于定語從句who will speak at the meeting tomorrow用的是將來時(shí)態(tài)，表示尚未發(fā)生動(dòng)作，所以用不定式來改寫。

2. Do you know the man who is sitting beside your wife?

= Do you know the man sitting beside your wife?

由于定語從句who is sitting beside your wife用的是現(xiàn)在進(jìn)行時(shí)，表示正在進(jìn)行的動(dòng)作，所以用現(xiàn)在分詞來改寫。

又如下面的例子：

3. The building which will be built next year is said to be our library.

= The building to be built next year is said to be our library.

由于定語從句which will be built next year用的是將來時(shí)態(tài)，表示尚未發(fā)生動(dòng)作，所以用不定式來改寫。

4. The building which is being built now is said to be our library.

= The building being built now is said to be our library.

由于定語從句which is being built now用的是現(xiàn)在進(jìn)行時(shí)，表示正在進(jìn)行的動(dòng)作，所以用現(xiàn)在分詞來改寫。

由于你的問題沒有寫完整，我們暫且將that you ever did see 視為定語從句，假若它所修飾的先行詞是the man，那么問題就成了the man that you ever did see，它的意思便是：你的確曾經(jīng)見過的那個(gè)人。其中的did在表示強(qiáng)調(diào)，又如：He did say you were a thief. 他的確說過你是小偷。I do like the girl. 我的確喜歡這個(gè)女孩。He does hope to go abroad. 他的確想出國。

有關(guān)句子成分的知識，請參見本站文章：www.52ysedu.com/Article/200805/295.html 
有關(guān)定語從句的內(nèi)容，請參見：www.52ysedu.com/Article/adjc /