1. 主語(名詞，代詞，不定式，動名詞，句子) 2. 謂語(動詞或動詞短語) 3. 賓語(名詞，代詞，不定式，動名詞，句子。跟不定式作賓語的常見動詞：want agree hope plan decide offer prefer wish intend fail desire refuse afford choose manage expect aim promise consent pretend neglect ignore omit happen determine demand threaten resolve decline propose undertake volunteer。