What we need is time.

What we need are good doctors.

【注意】

① 主语从句的时态：不受主句的时态影响和限制。

② 引导主语从句连词有that,whether,who,what,whatever等。

③ 连词位于句首不能省略。

④ 主语从句大多数情况下视为单三。

⑤ 为了防止句子头重脚轻，通常把形式主语it放在主语位置，真正的主语从句搁置于句末。如：It is certain that he will win the match.

(4) ...and that's why we moved into the house on Mango Street.

that's why... 那就是为什么...

【例句】That's why he is late for school.

(5) This was the house Papa talked about when he held a lottery ticket...

talked about 过去分词做后置定语

【例句】

The glass broken by my son has been swept away. 被我儿子打破的玻璃已经扫走了。

Hangzhou, known to the nation for its West Lake, has changed greatly. 以西湖闻名全国的杭州已发生很大变化。

【经典例题】

____to go to college,Mike spent most of his time in learning English.

A.Determining B.Determined C.To be determined D.Having determined

【答案】Ｂ。该题考过去分词短语做原因壮语

因为sb be Determined to do sth

也就是说 句子的逻辑主语与分词之间是被动关系所以答案是Ｂ

(6) But the house on Mango Street is not the way they told it at all.

the way +定语从句时，如果way在定语从句中作状语，则引导词用that/in which/省略不用。

【例句】

I don't like the way in which/that/ 省略 you speak to me.

(7) Mr. Chen suggested practising easy designs such as snowflakes.

suggest doing sth. 建议做某事