Question

1）So small was the mark that I could hardly see it

1）So small was the mark that I could hardly see it.
　　2）So quickly did the workmen finish their work that they were given a bonus.
so……that有完全和部分倒装，怎么判断是部分还是完全倒装？1和2有什么区别？

Answer 1

so……that中的so用于系表结构时用完全倒装，用于其它结构时用部分倒装。

第一句是主系表结构：
主语：the mark
系动词：was
表语：so small
第二句是主谓宾结构：
主语：the workmen
谓语：finish
宾语： their work
状语：so quickly(修饰谓语动词）

不明白的再问哟！祝你学习进步，更上一层楼！ (*^__^*)

Answer 2

第一句是完全倒装；第二句是部分倒装。
完全倒装是将整个动词提到主语之前，常发生在不及物动词作谓语的情况下，如第1句，又如：
Here comes the bus. （注意：人称代词作主语时不倒装，如：Here it is.）
部分倒装只是将助动词或情态动放在主语之前，真正的行为动词不倒装，常发生在及物动词作谓语的情况下，如第2句，又如：
Only then did he realize that he was wrong.

Answer 3

啊，竟然没悬赏分，本来想答的……