是動詞的不定式結構。動詞不定式為:to+動詞原形。類似的動詞短語結構還有:promise to do(許諾去做…),refuse to do(拒絕去做…),decide to do(決心去做…),pretend to do(假裝去做…),fail to do(做某事失敗),expect to do(期待去做…),agree to do(同意去做…) force to do(強迫去做…)等。