[文法] 請幫我看一個句子

[duringduring ()]

The first time that I went to New York,I went to an opera.
請問為什麼要加that
謝謝

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→ redfish0206:I went to New York已經是完整的句子了，而且，這句話
→ redfish0206:並不缺少主詞或受詞，所以，前面放個that，變成名詞子
→ redfish0206:句，作為the first time的同位語。