探究点1 yet的用法
yet
- 作副词,意为“还”,用于否定句和疑问句中：The tea is not cold yet. 茶还未凉。Have you read *Little Women* yet? 你读过《小妇人》吗？
- 作连词,意为“但是”：The boy is fat, and yet he runs very fast. 这男孩很胖,但却跑得很快。

情境应用
1. He said he would be late, he arrived on time. (yet)
2. Class is over. I . (还不想离开)

1. yet 2. don't want to leave yet

1. 句意为“他说他会迟到，______他准时到了”。前后句为转折关系，yet作连词表“但是”，故填yet。
2. “还不想离开”，“还”用yet，用于否定句，“不想离开”是don't want to leave，故填don't want to leave yet。

探究点2 add的用法
add动词,意为“添加；加”。add sth to sth意为“把……加入……”。
Don’t forget to add some salt. 不要忘了加些盐。
Some people like to add sugar to their tea. 有些人喜欢在茶里加糖。
情境应用
1. If you five to six, you will get eleven. (add)
2. Liu Xi some sugar her coffee just now. (把……加入……)

1. add
2. added；to

1. 根据题意“如果你把五加上六，你会得到十一”以及主句“you will get eleven”可知，此处是if引导的条件状语从句，应该用一般现在时，主语为you，因此动词用原形add。
2. 根据题意“刘希刚才在她的咖啡里加了些糖”以及时间状语“just now”可知，该句为一般过去时，所以第一个空应该用add的过去式added；根据“add sth to sth（把……加入……）”可知，第二个空应该用介词to。

探究点3 辨析borrow, lend与keep

You can borrow my bike from me and keep it for two weeks, but you mustn’t lend it to others. 你可以借我的自行车,而且可以借用两周,但是你不能把它借给别人。
情境应用
1. You can from your friends. (借一些书)
2. Could you ? (借给我一支钢笔)
3. —How long can I ? (借阅这本书)
—For two weeks.

1. borrow some books
2. lend me a pen/lend a pen to me
3. keep this book

1. "借一些书"表示借入，用borrow，结构为borrow sth from sb，故填borrow some books。
2. "借给我一支钢笔"表示借出，用lend，结构为lend sb sth或lend sth to sb，故填lend me a pen/lend a pen to me。
3. "借阅这本书"且与how long连用，用keep，故填keep this book。

探究点4 plan的用法

情境应用
1. We only to watch the play for an hour, but in the end we stayed for three hours. (plan)
2. I plan the Great Wall next weekend. (visit)
3. My mother asked me to for study. (制订一个计划)

1. planned 2. to visit 3. make a plan

1. 由"stayed"可知时态为一般过去时，plan的过去式是planned。2. plan to do sth为固定搭配，意为“计划做某事”，所以填to visit。3. “制订一个计划”对应的英文是make a plan，ask sb to do sth中to后接动词原形，所以填make a plan。