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You can't reduce them, because when the relative clause has an external subject, a non-finite form of the verb has to be used (such as the present participle or past participle). But the modal verb "can" is defective and lacks non-finite forms. It's true that "be able to" is commonly used as a substitute for the infinitive of "can." But "being able to" ...


Never think natives speak perfect English. Do you speak your native language perfectly? Hey, it's been such a long time since we last emailed each other. This sentence is correct. Since we last emailed each other is your starting point for your time period. Don't think it as an individual sentence but a point in the past. it has ...

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