1. 表示自然现象与普遍真理。
The Sun rises in the east.
Actions speak louder than words. 行动胜于语言。
2. 在时间、条件从句中表将来。
I’ll tell him when he comes.
They will do it if they are not very busy tomorrow.
注意:如果if从句表示一种愿望时,可用will+动词原形,will相当于情态动词。
If you will be quiet, I’ll tell you what happened.
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