時態為什麼一會兒現在時一會兒過去式？
. According to a survey conducted among a group of people who were in the same college class 10 years ago, those who are ready to give their cooperation to others all become rich or managers of all field, while not a single young man having difficulty in getting along with their classmates becomes an executive or boss.
調查是在過去發聲生的，所以用過去時態，但是說的道理是具有普遍意義的，所以，用一般現在時。
你為什麼一會兒寫現在「時」，一會兒寫過去「式」？
先把中文學好，再來問問題。
你給出的段落通篇都是現在時態啊。
According to a survey conducted (which is conducted) among a group of people who were in the same college class 10 years ago, those who are ready to give their cooperation to others all become rich or managers of all field, while not a single young man having (who has) difficulty in getting along with their classmates becomes an executive or boss.
整個句子描述的都是一個常態，所以要用一般現在時，而唯一用過去時的地方是對應「十年前」的一個表述。
看語境
幫我解釋一下這個句子的時態，謝謝
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