want to know if he needs any help请问这的if为社么是“是否”而不是如果?

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wanttoknowifheneedsanyhelp请问这的if为社么是“是否”而不是如果?wanttoknowifheneedsanyhelp请问这的if为社么是“是否”而不是如果?wanttokn

want to know if he needs any help请问这的if为社么是“是否”而不是如果?
want to know if he needs any help
请问这的if为社么是“是否”而不是如果?

want to know if he needs any help请问这的if为社么是“是否”而不是如果?
i want to know if he needs any help
这是宾语从句,从句是 he needs any help
这里if就是是否的意思,如果后面没有“or not”,可和whether替换.是if的另一种意思用法

if 有两个含义，一个是“是否”，一个是“如果”，
为什么是“是否”很简单，因为“如果”在这里行不通

额……if它有是否的意思可已有如果的意思，至于是哪个，那要看题意

用如果语句不通，是否符合语境，跟语法没联系吧！

如果;if 用作为如果，常用作为主将从现。
如：We'll go to the supermarket if it doesn't rain
(但请你注意：1.主句可以用祈使句来表示将来时，这时主句用一般现在时 Put on your coat if you feel cold
2.是真理的话，前后都用一般现在时)
解释为是否时，用法同wh...

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如果;if 用作为如果，常用作为主将从现。
如：We'll go to the supermarket if it doesn't rain
(但请你注意：1.主句可以用祈使句来表示将来时，这时主句用一般现在时 Put on your coat if you feel cold
2.是真理的话，前后都用一般现在时)
解释为是否时，用法同whether
E.g.: I dont't if he has passed exam
也可以用whether ,前后时态统一
用主将从现的还有：as soon as, when, before, until,unless，after……
这类词有很多情况都是用过去时的，但若主句是用将来时，从句就用一般现在时
如：I'll call you as soon as he comes back.
其他的也要注意主句的时态就可以判断了

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