在感覺動詞hear、listen to、feel、see、look at、watch、notice、observe、perceive、note、使役動詞let、make、bid、have、leave等後，作賓語補語的動詞不定式不帶to。但使役動詞get、set後面，作賓語補語的動詞不定式要帶to。
I felt my heart beat violently.
I saw a boy put a chocolate in his pocket.
The police officer watched the children cross the road.
The mother made the boy turn off the TV.
The teacher let the students go home.