百度作业网We don't know if it rains tomorrow.不是说if表 是否 时看具体时态吗为什么这里有to
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We don't know if it rains tomorrow.不是说if表 是否 时看具体时态吗为什么这里有tomorrow还用s
这是王后雄中考完全学案上32页的 错了吗
这是王后雄中考完全学案上32页的 错了吗
这个说法应该是错的.应该改为：We don't know if it will rain tomorrow.
if 既可以引导宾语从句,也可以引导条件状语从句.if引导宾语从句时,意为“是否”,从句的时态根据句子时间状语或主从句结构确定.而if引导条件状语从句时,意为“如果”,若主句为一般将来时或祈使句,则从句必须用一般现在时.
例子：
We don't know if it will rain tomorrow.
We won't go to the park if it rains tomorrow.
再问： 谢谢呀 那么as有既然的意思吗
再答： as 有“既然”的意思，表原因。例如： As you object, we won't go. 既然你反对，那么我们就不去了。
if 既可以引导宾语从句,也可以引导条件状语从句.if引导宾语从句时,意为“是否”,从句的时态根据句子时间状语或主从句结构确定.而if引导条件状语从句时,意为“如果”,若主句为一般将来时或祈使句,则从句必须用一般现在时.
例子：
We don't know if it will rain tomorrow.
We won't go to the park if it rains tomorrow.
再问： 谢谢呀 那么as有既然的意思吗
再答： as 有“既然”的意思，表原因。例如： As you object, we won't go. 既然你反对，那么我们就不去了。
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