be+过去分词+介词的短语放句首,表示”正在被。表示正在进行
过去分词+介词的短语放句首,表示”已经被“。表示已经完成
6)作状语:①表目的:
Heworkeddayandnighttogetthemoney.Shesoldherhairtobuythewatchchain.
注意不定式放句首时,逻辑主语与句子主语要一致:wrong:Tosavemoney,everymeanshasbeentried.right:Tosavemoney,hehastriedeverymeans.
wrong:TolearnEnglishwell,adictionaryisneeded.right:TolearnEnglishwell,heneedsadictionar