八年級英語上冊Unit 2 How often do you exercise?知識點歸納
a.take, doing b.spend, doing \c.spend, for doing d.take, to do
9. however,she has some bad habits,too. 然而她也有一些壞習慣。（教材第15頁）
however 意為“然而，不過”。可以位于句首、句中、句末。但要用逗號與句子的其他部分隔開。
eg: she was ill. however, she still went to work. 她病了，然而她依然去上班。
辨析：but和however
but 并列連詞 “然而，但是”。 可直接連接前后兩個句子，表轉折關系。
however 副詞 “然而，但是”。 不能直接連接句子，必須用逗號與句子隔開。
eg:1.it began to rain, ,we went out to look for the boy. 天開始下雨了，但我們還是出去尋找那個男孩了。
2. it a sunny morning， very cold. 這是個晴朗的早晨，但是卻很冷。
10.she usually watches tv for more than two hours a day. 她通常每天看兩個多小時的電視。（教材第15頁）
more than 相當于over。意為“超過，多余”。
there are more than books. ________________________________
11. she says she is afraid. 她說她害怕。（教材第15頁）
afraid 意為“擔心的，害怕的”。
①.be afraid to do sth. 害怕做某事 eg：i am afraid to travel by plane. 我害怕乘飛機旅行。
②.be afraid of sb.\ sth. 害怕某人\某物
be afraid of doing sth. 害怕做某事 eg：she is afraid of the dog. 她害怕那只狗。
don’t be afraid of asking questions. 不要怕問問題。
be afraid to do sth.= 害怕做某事
12. less than six. 少于6小時。（教材第16頁）
less than 意為“不到，少于”。其反義詞為 more than \ over “多余，超過”
eg：she sleeps less than seven hours every night. 他每晚的睡眠時間不到7小時。
we know tom for 20 years. 我們認識tom超過20年了
13. how often 多久一次，用來提問動作發生的頻率。回答用：once，twice, three times 等詞語。
how often do you play sports? three times a week.
how long 多長，用來詢問多長時間，也可詢問某物有多長。