我和我朋友在滑雪（are skiing）。you should add a word 昨天（yesterday）or刚才（just now）before the sentence to represent the past time. Just like, 刚才，我和我朋友在滑雪（me and my friends were skiing just now) or you can say刚才，我和我朋友去滑雪了（means we skied just now）。
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