Different tenses. One is present tense. One is past tense. So, it would depend on whether the subject of the sentence is currently having difficult times or whether the difficult times are over.
6 Kasım 2017
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"He is going through a difficult phase of his life" sounds a lot more natural to me.
5 Kasım 2017
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Hâlâ cevap bulamadın mı?
Sorularını yaz ve ana dil konuşanlar sana yardım etsin!