1. 当and或or连接两个并列不定式时，第二个to常省。 I plan to call him and discuss this question. 我计划给他打电话，讨论一下这个问题。 My friend in China asked me to telephone or write to her in my freetime. 我中国的朋友让我有空给她打电话或写信。 2. 当两个并列to有对比意义，第二个to不能省。 I haven’t decided to stay at home or to travel to Beijing this holiday. 我还没决定假期是待在家里还是去北京旅行。 To be, or not to be, that is the question. 生存还是毁灭，这是一个值得思考的问题。(《哈姆雷特》) 3. 当两个to之间无并列连词，to不可省。 I came here not to help you, but to fright you. 我来这不是为了帮你，而是为了吓唬你。 4. 当三个或以上带to不定式构成排比，所有to不可省。 Read not to contradict or confute; nor to believe and take for granted; notto find talk and discourse; but to weigh and consider.
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