过去分词短语和过去分词从句做状语间的转换
问题描述：
过去分词短语和过去分词从句做状语间的转换
1）If/When(it is) heated,water changes into steam.
2）Though (he was) invited,he did not attend the dinner party.
以上两句怎么转换成过去分词短语做状语啊!
是不是：
1）heated,water changes into steam.
2)invited,he did not attend the dinner party
答
只要逻辑主语一致 可以省略主谓
1）If/When heated,water changes into steam.
2）Though invited,he did not attend the dinner party.