three years ago 在句子中作狀語用時，前面無需加介詞。 three years ago 是名詞性片語。表達時間狀態的名詞片語可直接用於句子中修飾謂語。由於名詞時間狀語片語的句子功能是副詞性的，因此在句子中的位置非常靈活，可置於句首、句中或句末而不影響語義表達。除非語義表達需要，名詞短語作時間狀語的一大特點是不需要介詞引導。例： Three years ago, she had tremendous difficulties in her life but still completed her master"s degree. She had tremendous difficulties in her life three years ago but still completed her master"s degree. She had tremendous difficulties in her life but still completed her master"s degree three years ago.
three years ago 在句子中作狀語用時，前面無需加介詞。 three years ago 是名詞性片語。表達時間狀態的名詞片語可直接用於句子中修飾謂語。由於名詞時間狀語片語的句子功能是副詞性的，因此在句子中的位置非常靈活，可置於句首、句中或句末而不影響語義表達。除非語義表達需要，名詞短語作時間狀語的一大特點是不需要介詞引導。例： Three years ago, she had tremendous difficulties in her life but still completed her master"s degree. She had tremendous difficulties in her life three years ago but still completed her master"s degree. She had tremendous difficulties in her life but still completed her master"s degree three years ago.