初二英语、将下列句子合并为含有宾语从句的复合句

1,He wants to know whether it is polite to smoke during a meal in France.

2,Can you tell her whether there are two or more courses for every meal in North America.

3,She asks whether she needs to add more sault.

4,He is not sure whether it is polite or not to speak loudly at the table in China.

5,Do you know whther it is impolite or not to put the fork on the left side of the plate.

祝你进步

为什么上面两个都用whether呢？其实也可以用if的、
1.He wants to know if(whether) it is polite smoke during a meal in France.
2.Can you tell her if(whether) there are two or more courses for every meal in North America.
3.She asks if(whether)i need to add more salt.
4.He is not sure whether it is polite or not to speak loudly at the table in China.(因为这句中有not，所以必须用whether）
5.Do you know whether it is impolite or not to put the fork on the left side of the plate.(和上句原因相同）

不知道这样写能否理解、

1.He wants to know if it is polite to smoke during a meal in Franc.
2.Can you tell her if there are two or more coruses fo every mealin Norht America?
3.She asks if I need to add more sait?
4.He is not sure whether it is polite or not to speak loudly at the table in China?
5.Do you know whether it is impolite or not to put the fork on the left side of the plate.

1、He wants to know whether it is polite to smoke during a meal in France?

2、Can you tell her that there are two or more courses for every meal in North America?
3、She asks whether i need to add more sait?
4、He is not sure whether it is polite or not to speak loudly at the table in China?
5、Do you know whether it is impolite or not to put the fork on the left side of the plate

1.Can
you
tell
me
if
Jane
comes
from
England?
2.I
don't
know
if
Bill's
father
often
rides
a
bike
to
work
.
3.I
want
to
know
if
they
can
finish
the
work
today.
4.Miss
Wang
doesn't
know
if
the
students
are
interested
in
the
movie.
5.Please
tell
me
if
it
is
polite
to
touch
a
boy's
head
in
Thailand.
把所有的is换成whether也可以!