Are used in what. your question is somehow
Because of the position of the Earth. When we spin around on our axis, the moon turns around too, because of shadows, the shadow covers most of the moon at certain times
Myself : Hello friend, How do you do?
Friend : I am fine, thank you. Why are you looking so sad?
Myself : Actually I am worried about my final examination What about your preparation for the examination?
Friend : Well, I’m going on well my studies. I am also worried about my exam.
Myself : But tell me about your preparation in different subjects.
Friend : You know I’m weak in English. That’s why, I’m taking special care in English. I’m having a detailed revision in other subjects.
Myself : Are you taking help from any special books?
Friend : Yes but I study text books very carefully.
Myself : I see. I must start working with the text books. What do you think?
Friend : Yes. I think it’ll be very helpful not only for English but also for other subjects.
Myself : Thank you for your supportive suggestion. I wish you good luck.
Friend : You are most welcome