老师：Hello, dear students, this is Stella from Pseudo Science and Technology Town Foreign Language School. Welcome to my class. Today we will learn Unit 4, Monday, Grammar.
老师：同学们大家好，我是来自苏州科技城外国语学校的顾老师，欢迎走进我的课堂。今天我们将一起来学习 unit four my day grandma。
老师：In this class, we will learn to use correct prepositions to talk about time. We will also learn to use proper adverbs to talk about how often things happen. Surely we will do some practice to help you consolidate what you Learned. Propositions of time. We use different prepositions to talk about time. Let's do a mini quiz. Please complete the sentences within, on or at.
老师：It is very cold in winter. Children's Day is on June the first. They do morning exercises at 8:00. Did you do that correctly? From the examples, we can find that Sinus 1 is about seasons. Sentence 2 is about dates. Sentence 3 is about time of day. We use different prepositions to talk about time.
老师：Now let's try to work out the rules. Please look at the examples and try to find out the rules. When should we use preposition at? Milly Yearly goes to school at 7:20. Milly's school starts at 8 in the morning. Milly's lessons begin at a quarter past eight. We can find we use at before time of day. Tommy wants to go to America at eighteen, children in China start school at 6 years old. Can you find the rule? Yes, we also use at before age. Besides time of day and age, we use at before parts of day, such as at night, at lunchtime. We use at before holidays without day, such as at Christmas, at Easter.
老师：Now, please look at the following examples and find out when we should use preposition. In. Our school starts at 8 in the morning. Sometimes I go to the library in the afternoon. We use aim before parts of day. Please read the following examples. We plant trees in March every year. We use aim before months. In Hainan. It never snows in winter. Can you find another rule? Yes, we should use aim before seasons.
老师：The 22nd World Cup is in 2022. We use in before years. Please keep your rule in mind. We use aim before parts of day, months, seasons and years. We also need to use aim before centuries, such as in the 15th century. We use in before weeks, such as in a week, in two weeks.
老师：Now, please look at the examples and find out when we should use preposition on. We often read books there on Tuesday and Thursday. We practice after school on Wednesday afternoon.
老师：What is the rule? Yes, we use on before days. Our summer holiday starts on July the first. We use arm before dates. Amy goes swimming on Sunday morning. We use arm before parts of a specific day. They have lots of fun on Children's Day. What is the rule? We use arm before special holidays. Did you work out the rule?
老师：We use arm before days, dates, parts of a spec
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