I have great trouble in learing English.
Could you help me?
There is a big tree in the centre of the garden.
Mary is my sister. She is good at swimming.
Mike has trouble learning English.
The students will go to the Summer palace if doesn't rain tomorrow.
主将 if 从现
无论if 在句首或是句中，紧跟着if 的就是从句。
例 I will travel （travel）if I find （find）the treasure.
If it rains heavily this afternoon.Uncle John will stay at home.
Don't be worried . He will call you if he arrives in New York.
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