1.mary often exercises and she is quite well.

1.mary often exercises and she is quite well.
本句中的exercises 为什么要加s呢?
2.You hardly know him,-----?
A.are you B.aren't you C.do you D.don't you
（解释下意思和选择的原因）
3.sometime、sometimes、some time的区别
4.------in the class like playing the game.
A.Most us B.most of students
C.Most of the boys D.Most student
(解释下用法区别）
5.You sister is too young.You should look after her ------.
A.good B.nice
C.fine D.well
6.She ------- the book two years ago.
A .read B.reads C.readed D.red
7.will it rain tomorrow?
A.I think so B.I think it C.I don't think it D.I think not
8.He finished ------his bedroom.
A.cleans B.clean C.cleaning D.to clean
9.Did you finish reading the novel
句中read为什么要加ING?
10.I don't think think there is ---.
A.something serious
B.nothing serious
C.anything serious
D.serious anying
11.He spent one day ------with his friends.
A.play B.playing C.to play D .plays
12.They will finish -----in ten minutes.
A.talk B.to talk
C.talking D.talks
希望回答的朋友可以帮我比较一下可选项的区别等

1．单三阿．．当然要加s．
2．C 动词为KNOW 而不是BE动词 所以AB排除 ； HARDLY 意思是”几乎不” 已经带有否定成分 反意疑问句类型为前否后肯 所以D排除只能选C．
3．（1）sometimes的意思是“有时”,是副词.例如：
Sometimes he comes by bike and sometimes by bus.
他有时骑车来,有时乘公共汽车来.
（2）sometime也是副词,意思是“在某个时候”.可用于一般过去时与将来时.例如：
You can hand in your homework sometime before Friday.
你可以在周五前某个时候交作业.
（3）some time是名词短语,它的意思是“一段时间”.例如：
I'll be away for some time.我将离开一段时间.
（4）some times也是一个名词短语,time在这里用作可数名词,意思是“次数”.
some times的意思是“几次”.例如：
I have been to the Great Wall some times.
我去过长城几次.
有一个口诀可以帮助记忆：
分开“一段时间”,相聚“某个时候”；
S连住是“有时”,分开“几次”、“几倍”行.
some和time分开写时表示“一段时间”,连着写时表示“某个时候”；有S连着写时表示“有时”,分开写表示“几次”、“几倍”的意思.
4．C吧 因为OF后面一般要加THE D要是STUDENT加了S是对的 A如果是MOST OF US就对了
5．D LOOK AFTER是动词 后面要加副词来形容它 所以ABCD只有D WELL是副词 其他是形容词 排除
6．选A READ这个词很特殊 过去式还是原形READ只是读音变了为／RED／排除CD B肯定不可能因为”TWO YEARS AGO”嘛．．排除
7．A 常用口语．． I THINK SO．背过就是了 否定形式是I DON’T THINK SO．
8．C FINISH这个词后＋DOING形式
9．呃 你语法学得不好是吧 同上题FINISH＋DOING固定用法．．问为什么找古老的英国人去．．
10．C 首先D排除 因为SOMETHING ANYTHING NOTHING 这些不定代词都是定语后置．然后前面是I DON’T否定形式 所以后面不能再否定了 排除B同时也可以排除A 因为否定句当中SOME都要变成ANY．
11．B SPEND的用法是SPEND TIME （IN） DOING SOMETHING ． 其中的IN可以省略所以就成了SPEND ONE DAY PLAYING WITH HIS FRIENDS．
12．C 还是FINISH＋DOING的形式
朋友 看得出来你语法学得不好．． 但语法这个东西就得靠背 靠记．．应付考试嘛．．