Question

英语不会

Our classroom __________(clean) every day.
　　How often __________ your clothes ______________(wash)? Every two days.
　　He is made _________(stay) at home on Sunday.
　　The twins ___________(ask) to come again yesterday.
　　The bike ________(return) by my uncle tomorrow.So far, a lot of trees __________(plant).
　　A book must _________(read) more than once.//The little boy should ________(take) good care of.
　　A talk on history _______(give) in our school next week.
　　The picture _________(take) down by the twins just now.
　　Coke __________(sell) all over the world.//The fish ___________(eat) up by him an hour ago.
　　The sweater ________(buy) yesterday.//Trousers __________(make) in this factory.
　　The trees in front of the house ________(water) by my father every day.
　　An English song ___________(learn) tomorrow.//________ the bike ________(ride) by you? Sometimes.

Answer 1

is cleaned (every day 用一般现在时）
are ； washed (根据后文可知应用一般现在时）
to stay(make的被动语态要加to）
were asked
will be returned ； have been planted
be read；be taken
will be given
was taken
sailed ；was eaten
was bought； are made
are watered
will be learned ； Is ridden

我不知道这样直接告诉你答案好不好 ，但我觉得有些东西还是背一下比较好。
你这边的题目全是被动语态，基本形式是be动词加done（即动词过去分词）。你要先把语态确定了再确定时态，改变形式。将来时就是 will be done ,一般现在时就用 have /has been done ……至于怎么看时态，老师教过的吧，记得找关键词就好。
呃、还有一些是特殊情况。系动词没有被动语态、还有make等词的被动语态要加to，我一时半会儿也说不清楚、不会的就问吧。问着问着就问明白了也记住了。
大概就这样了、该背的不要偷懒。

Answer 2

1.clean
2.were washed
3.staying
4.were asked
5..will be returned have been planted
6.be read be taken
7.will be given
8.has been taken
9.sells was ate
10.was bought were made
11.is watered
12.will be learned Was riden

Answer 3

1.was cleaned
2.were washed
3.to stay
4.were asked
5.will be returned;have been planted
6.be read;be taken
7.will be given
8.was taken
9.sells;eaten
10.was bought/has been bought ;were made
11.are watered
12.will be learned;Was riden