46　to用作介词和不定式符号的区别

1　to 可以作介词，也可以是不定式符号。作介词用时，to 表示“给，到”等意。

She sent a letter to Jim. 她给吉姆寄了一封信。

He took his sister to school. 他把他妹妹带到了学校。

They carried the desks to the classroom. 他们把书桌搬到了教室里。

2　to 又是动词不定式符号，常用在want to do sth., wish to do sth., would like to do sth., ask sb. to do sth., tell sb. to do sth.等结构中。

He'd like to try again. 他想再试一次。

He told her to wait under a tree. 他叫她在一棵树下等着。