不定式作主语也可以省略 to,这要从 “确认性表语” 上面找原因。逻辑上,确认性表语可以和主语互换位置,而句子意思保持不变。但是,它们的语法作用变了:原来的主语变成了表语,表语变成了主语。既然作表语时 to 可以省略,那么在主语的位置上,似乎也同样适应。
因此就有了如下几种说法:
1. What I want to do this afternoon is to watch a football match.
2. What I want to do this afternoon is watch a football match.
由于不定式是“确认性表语”,所以,主表可以交换位置:
1. To watch a football match is what I want to do this afternoon.
2. Watch a football match is what I want to do this afternoon.
先不说能不能省略 to,我认为,用不定式开头作主语,语法虽然正确,但不太合乎口语的表达习惯,感到绕口。为了避免是否带 to 的尴尬,最好改为动名词:
Watching a football match is what I want to do this afternoon.
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