(1)不定式的被动式表示其逻辑主语为不定式动作的承受者。
*It’s a great honour to be invited to Mary’s birthday party.
被邀请参加玛丽的生日聚会是一件非常荣幸的事情。
(2)不定式的否定式通常是将否定词not或never置于不定式之前, 即构成not to do 或never to do 这样的形式。
*They took a vote and decided not to do it.
他们进行了表决, 决定放弃。
*How many times has your mother told you never to talk to strangers?
你母亲告诉你多少次了, 绝不能和陌生人谈话?
