7AUnit4語法知識點

1、7A Unit4語法知識點1. It's very easy for me to get tired when I dance.我跳舞時很容易感到累。該句為一固定句型：It's + adj. + (for sb) + to do sth“做某事對于某人來說是”，句中It為形式主語，真正的主語是后面的動詞不定式結構。It's very hard for us to finish the work on time.要按時完成這項工作是非常困難的。It's very important for everyone to celebrate Christmas.慶祝圣誕節(jié)

2、對每個人來說都是很重要的。2. I usually have fruit and vegetables because I want to be healthy.因為我想健康，所以我經常吃水果和蔬菜。because是連詞，意思是“因為”，用來引導表原因的狀語從句。在漢語中常用“因為，所以”表原因和導致的結果，但在英語中這樣的關聯(lián)詞不能同時出現在一個句子中，只能用其中一個。He doesn't come to school because he is ill.= He is ill so he doesn't come to school.因為他生病了，所以沒來上學。3. 英語中

3、表示頻率的副詞按頻率由高到低依次是：always, usually, often, sometimes, seldom, neverShe always gets up at six.她總是六點鐘起床。They sometimes go skiing in winter.冬天他們有時去滑雪。對頻率副詞提問用how oftenHow often do you go swimming? 你多久去游一次泳？I never go swimming. 我從不去游泳。  4. This helps me start the day.  這幫助我開始一天（的生活）。  5. I

4、 need vitamin to get healthy.  我需要維他命來保持健康。6. I sometimes have rice with fish and an apple for lunch.午餐我有時吃米飯，以及魚和蘋果。rice和fish這里是不可數名詞；apple是可數名詞。單數可數名詞之前須有不定冠詞a或an，不可數名詞之前沒有。句型：1). Sandy doesn't have much time to play badminton.桑迪沒有多少時間打羽毛球。2). I think we need some Coke and three cartons of milk.我認為我們需要一些可樂和三紙盒牛奶。3). There's a carton of milk,