【急用!指出下列句子中不定式的句子成分1.Iwanttobuyanewpairofshoes（）2.Heforgottobringyourdictionary()3.WhendidyoustarttolearnEnglish?()4.Heislearninghowtodrive.()5.Ihaven'tdecidedwhentoleave.()6】

　　急用!指出下列句子中不定式的句子成分

　　1.Iwanttobuyanewpairofshoes（）

　　2.Heforgottobringyourdictionary()

　　3.WhendidyoustarttolearnEnglish?()

　　4.Heislearninghowtodrive.()

　　5.Ihaven'tdecidedwhentoleave.()

　　6.Wewenttohelpthrfarmerswiththeharvest.()

　　7.Let'sstoptohavearest.()

　　8.I'lltrymybesttocatchupwithmyclassmates.()

　　9.I'mgladtoseeyou.()

　　10.I'msorrytohearthat.()

　　11.Heistooyoungtogotoschool.()

　　12.Hedidn'tworkhardenoughtolearnEnglishwell.()