1、作及物動(dòng)詞，后接 who ,what ,why ,where 等引導(dǎo)的賓語(yǔ)從句。例句：I wonder who she is.我想知道她是誰(shuí)。2、作及物動(dòng)詞，后接 that 引導(dǎo)的賓語(yǔ)從句,表示“感到驚奇；對(duì)……感到驚訝”,that ?？墒∪?。例句：I wonder (that) she has won the race.我對(duì)她贏了比賽感到驚訝。3、用作不及物動(dòng)詞。例句：I was just wondering.我只不過(guò)是好奇而已。