何时动身尚未决定。 （不定式短语作主语）
The difficulty was how to cross the river.
困难在于如何过河。 （不定式短语作表语）
注意：没有why to do it这种说法。
〖例〗根据句意，选取括号中正确的词语填空。
1. Could you tell me_____________ (where, where to) buy this fruit?
2. I went there __________ (to see, saw) him.
3. Remember _____________ (when to return, when return)
4. I’ll show you _____________. (how to do it; how to do)
5. My plan is _____________ (to do, do) the work next week.
6. He was the first man ___________ (to learn, learn) the news.
解答：
1. where to（动词不定式和疑问词连用。）
2. to see（动词不定式作目的状语）
3. when to return （不定式和疑问词连用。）
4. how to do it （不定式和疑问词连用。）
5. to do（动词不定式作表语）
6. to learn（动词不定式作定语）
二、have (has) been to 与have (has) gone to的区别have (has) been to表示主语去过某地，而现在已不在那里；have (has) gone to表示主语去了某地，现在已不地此地。如：
My teacher has been to Japan twice.
我的老师曾到过日本两次。（现在不在日本）
My teacher has gone to Japan.
我的老师到日本去了。（现在不在此地了，有可能到了日本，有可能还去日本的路上）
易混点：
例如：
①A．Where have you been? (√)
B．Where have you gone? (×)
C．Where has he gone? &nbs
《Merry Christmas!(第3页)》出自：www.89xue.com网www.89xue.com p; (√)
D．Where has he been ? (√)
②A．He has been to Dalian. (√)
B．He has been in Dalian. (√)
C．He has gone in Dalian. (×)
D．He has gone to Dalian. (√)
辨析：
①have gone 人已走了，无法问“你上哪儿去了？”
②have gone to + 地点，到某处去了，不用gone in + 地点。
have / has been / gone to接地点名词，若接副词，如：away, home, out, 则不用to。例如：
Where have you been? 你到哪儿去了？
I’ve been away/ home / out. 我外出了/回家了/出去了。（现在我在这儿）
Where has Mary gone? 玛丽到哪去了？
She has gone away/ home/ out.
她外出了/回家了/出去了。（现在她不在这儿）
have/ has been in 是指在某地呆过或人仍在某地。
〖例〗根据句意，选取括号中正确的词语填空。
1. He has __________ (been, gone)there many times.
2. — Where’s Jim?
— He __________ England. (went to, has gone to)
3. Mr Green _________ China for three years. (has been to, has been in, has gone to)
4. Bruce is young, but he ___________ many foreign countries. (has been in; has been to; has gone to)
答案：1. been (has been there是“到过那里”的意思。)
2. has gone to（他已经去了，本人不在说话的地方。）
3. has been in（呆在某个地方用has been in）
4. has been to（到过某地用has been to。）
教学设计示例
Lesson 29
Period: The First Period
Content: Lesson 29
Properties: Tape recorder
Teaching Objectives: Enable the students to grasp some useful expressions and something about Christmas Day.
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