英语语法高手请进

Question

The pen iscomfortable to write with.
to write with 作什么句子成分？

Answer 1

The pen iscomfortable to write with.
to write with 作什么句子成分？
答：大侠用我随手造的句子作为例句啊！
主语+系+形容词+不定式，这个不定式的句子成份，不同的情况有不同的说法。语法学家还没有统一呢！
章振邦在其《新编英语语法》称之为形容词补足成分。（adjective complementation)
又可以分成三种类型
第一种类型又有四种情况（有的分五种）,特点：主句的主语是不定式的逻辑主语
　1.　Henry was happy to hear it. 　喜怒哀乐形容词
　2.　George was lucky to find it.　　运气好坏形容词
3. He was anxious to see her.　　　心理状态、个人态度形容词
4. He is foolish to meet her again.　　性格特征、行为表现形容词
(5) He is likely to see Mary. 　　　　可能性、确定性形容词
　第二种类型　特点：　主句的主语是不定式的逻辑宾语。
　　1.　Mary is easy to teach. --> To teach Mary is easy.
2. The coffee is bitter to taste. X-->不能如上改写。
　第三种类型：主句的主语可以是不定式的逻辑主语，也可以是不定式的逻辑宾语：
Geroge is quick to take offence.
=George takes offence quickly.
The clothes are easy to wash.
=The clothes was easily.
=It is easy to wash the clothes.

本题句属于第二类的第一种。也有语法说它是状语的。作什么状语，说不清楚。

Answer 2

to write with 作状语

Answer 3

做状语，表示comfortable的程度

Answer 4

用来修饰形容词comfortable，应该是伴随状语吧，表明一种状态，“写起来比较容易”

Answer 5

我不知道