她一直是我的好朋友，自从我们上小学就认识了。
She has been my good friend since we were in primary school.
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since英 /sɪns/|美 /sɪns/
解释
since 在这里是连词，表示"从...时候起"，用来引出时间状语从句，说明友谊开始的具体时间点。
She has been my good friend since we were in primary school.
since 在这里是连词，表示"从...时候起"，用来引出时间状语从句，说明友谊开始的具体时间点。
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