动词不定式是高考的必考内容之一，其考查内容多且复杂，高考中常考查不定式作主语、状语、宾语、补语、表语和插入语；不定式的时态和语态，主动表示被动意思等；动词不定式符号“to”的省略也在考查范围之内。
●难点磁场
1.(★★★★★)There are five pairs________,but I’m at a loss which to buy.
A.to be chosen from B.to choose from
C.to choose D.for chosing
2.(★★★★)________late in the morning,Bob turned off the alarm.
A.To sleep B.Sleeping C.Sleep D.Having slept
