用于肯定句中,在否定句和问句中改为any,但当表示委婉语气时仍用
如:Can I have some writing paper?Would yolike some orange juice?
12.代词
人称代词主格做主语用一般放在句首或动词前,主格分别是I yohe she it we yothey。
宾格做宾语用,一般放在动词或介词后
如:Open them for me.Let us…,join me等。
宾格分别是me yohim her it us yothem。
形容词性物主代词放在名词前,不能单独使用,分别是my your his her its our your their
名词性物主代词相当于形物加名词,它只能单独使用后面不好加名词,分别是mine yours his hers its ours yours theirs。
13.介词
介词后要么不加动词,加动词只能加动词ing形式
如:be good at running;
do well in jumping;
14.时间介词
季节前,月份前用介词in
如:in summer;in March
具体的哪一天如星期几,几月几日用介词on
如:on Saturday;>
在几点钟前用介词at
如:at a quarter to four;
只在上下午晚上用in
如:in the morning/afternoon/evening;
但在夜间用at night。
另:季节,月份和星期前不好加the.
15.名词复数构成的方法
有规则的有:
(1)直接在名词后加s
如orange—oranges;photo—photos;
(2)以x,s,sh,ch结尾的加es
如:box—boxes;glass—glasses;waitress—waitresses;watch—watches;peach--peaches
(3)以辅音字母加y结尾的改y为i加es
如:study—studies;library—libraries;hobby—hobbies;family—families;
(4)以f,fe结尾的改f,fe为v+es如:knife—knives;thief—thieves(注:以o结尾的我们学过的只有mango加es,mango—mangoes其余加s,)
不规则的有:
man—men;woman—women;people—people;child—children
16.动词第三人称单数的构成
(1)直接在动词后加s
如:run—runs;dance—dances
(2)以s,sh,ch,o结尾的加es
如:do—does;go—goes;wash—washes;catch—catches