什么叫If引导的宾语从句？ If 引导的定语从句和宾语从句有什么分别？
if\u5f15\u5bfc\u7684\u6761\u4ef6\u72b6\u8bed\u4ece\u53e5\u3001\u5bbe\u8bed\u4ece\u53e5\u7528\u6cd5......\u5fd8\u4e0d\u4e86\u672c\u3002.
if
\u4e0d\u80fd\u5f15\u5bfc\u5b9a\u8bed\u4ece\u53e5\u3002\u5b83\u80fd\u5f15\u5bfc\u72b6\u8bed\u4ece\u53e5\u548c\u5bbe\u8bed\u4ece\u53e5\u3002\u72b6\u8bed\u4ece\u53e5\uff1a\u8868\u5982\u679c\u3002\u4f8b\u5982;
If
it
rains
tomorrow,we
will
put
off
the
sports
meeting.
\u5bbe\u8bed\u4ece\u53e5;
I
am
not
sure
if
he
will
attend
my
birthday
party.
一、if引导宾语从句时，作“是否”讲，常放在动词ask 、see 、say 、know和find out等后面。如：
例1 Nobody knows if it will rain tomorrow. 没有人知道明天是否下雨。
例2 Lucy asked if they had a cotton sweater .露西问他们是否有棉制的羊毛衣。
二、if引导宾语从句时，要注意三个方面，即连词、语序和时态。
1 if不能和that 或其它连词（副词）同时使用，也不能省去。如：
例3 我不知道他今天是否会来。
[误] I don’t know that if he will come here today .
[正] I don’t know if he will come here today .
例4他走过来看看猫是否出了毛病。
[误] He came to see what if there was wrong with his cat .
[正] He came to see if there was wrong with his cat .
2 if引导的宾语从句时，虽具有疑问意义，但从句语序应用陈述句语序。如：
例5 Did you know the way to the hospital ? The old woman asked me .
The old woman asked me .if I knew the way to the hospital .老妇人问我是否知道去医院的路。
3 if引导的宾语从句应和主句的时态保持一致。即主句为一般现在时，从句用任一种时态；主句为一般过去时，从句则用过去时中的任一种时态。如：
例6 I don’t know if he has come here . 我不知道他是否来过这儿。
例7 Tom asked if I had read the book . 汤姆问我是否看过这本书 。
引出宾语从句的连词分为“that 、whether 、if 、wh-”
其中if 和whether 引导宾语从句时 ，意为“是否” ，含有不确定性，不在从句中充当成分。
如 I asked her if /whether she heared from Uncle Li .
(我问她是否收到了李叔叔的来信）
祝学习进步
这是由一般疑问句变来的。引导的从句放在谓语动词后面。
例如： I don't know if he will go there.
老师祝你学习进步！
望采纳，多谢！^_^
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