It was beginning to rain. A native speaker of English told me that means the speaker was experiencing a process of raining from no rain drops to more and more rain drops. This is correct.
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alexclxBut some grammars say "begin" in progressive tense refers to a future eventThat is misleading. The present progressive can refer to an on-going present activity, or it can refer to an arranged/planned future activity. Rain is not something that people can arrange or plan the beginning of.