您好,老师。最近看到下面几个例句, 对连词/介词和不定式前面的to 有疑惑,望给予解惑,谢谢。
1. 柯林斯词典:Ida would not speak to him except to answer questions... (此处except,词典标为连词,其后不定式前面有to).
2. 柯林斯词典:Nothing more to do now except wait. (此处except,词典标为连词,其后不定式前面没有to)。
3. 薄冰语法: I can do nothing for them except to send them money. (此处except被看作介词,其后不定式前面有to).
4. 牛津词典: I had no choice but to sign the contract. (此处but, 词典标为连词,其后不定式前有to).
5. 薄冰语法:I could do nothing but just sit there and hope. (此处but 被看作介词,其后不定式前没有to).
请问以上例句中的except, but 应该看作连词还是介词?其后不定式的to 什么时候需要有?什么时候不需要?
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