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1、牛津英语7A unit4语法知识点1. Its very easy for me to get tired when I dance.我跳舞时很容易感到累。该句为一固定句型：Its + adj. + (for sb) + to do sth“做某事对于某人来说是”，句中It为形式主语，真正的主语是后面的动词不定式结构。Its very hard for us to finish the work on time.要按时完成这项工作是非常困难的。Its very important for everyone to celebrate Christmas.庆祝圣诞节对每个人来说都是很重要的。2.
2、I usually have fruit and vegetables because I want to be healthy.因为我想健康，所以我经常吃水果和蔬菜。because是连词，意思是“因为”，用来引导表原因的状语从句。在汉语中常用“因为，所以”表原因和导致的结果，但在英语中这样的关联词不能同时出现在一个句子中，只能用其中一个。He doesnt come to school because he is ill.= He is ill so he doesnt come to school.因为他生病了，所以没来上学。3. 英语中表示频率的副词按频率由高到低依次是：always,
3、usually, often, sometimes, seldom, neverShe always gets up at six.她总是六点钟起床。They sometimes go skiing in winter.冬天他们有时去滑雪。对频率副词提问用how oftenHow often do you go swimming? 你多久去游一次泳？I never go swimming. 我从不去游泳。 4. This helps me start the day. 这帮助我开始一天（的生活）。 5. I need vitamin to get healthy. 我需要维他命来保持健康。6.
4、 I sometimes have rice with fish and an apple for lunch.午餐我有时吃米饭，以及鱼和苹果。rice和fish这里是不可数名词；apple是可数名词。单数可数名词之前须有不定冠词a或an，不可数名词之前没有。句型：1). Sandy doesnt have much time to play badminton.桑迪没有多少时间打羽毛球。2). I think we need some Coke and three cartons of milk.我认为我们需要一些可乐和三纸盒牛奶。3). Theres a carton of milk, a carton of orange juice and a bottle of Coke.有一纸盒牛奶，一纸盒橙汁以及一瓶可乐。
