Here are some examples, hope it helps Eu estudo de manhã - I study in the morning De manhã eu não consigo estudar direito - In the morning I can't study well A luz da manhã - morning light (The light of the morning) São 4 (horas) da manhã - It's 4 in the morning Eu te procurei pela manhã (inteira) - I looked for you all morning (It implies that it happened throughout the morning) Vamos dirigir pela noite - We will drive throughout the night; which is slightly different from we will drive at night, but doesn't make a huge difference.