to do,to start,work,start区别

疑问词加不定式
the question is when to start中when是to start的逻辑宾语,那么to start 不就作谓语了吗 可是动词不定式不是不能做谓语吗 希望哪位高手能帮我解决一下.
那这个句子不就没有谓语了吗 再比如说he showed me how to use a computer中 how是状语 a computer是to use的宾语 to use不就是a computer的谓语了吗 这个怎么解释啊

用方框内所给短语的正确形式填空 let down,kick sb.off,to start
ith

.To start _______,you need a map.
A.at B.for C.with D.of
2.He has very good ______ in music.
A.smell B.look C.sound D.taste
3.The hotel has _________tourists at the foot of the mountain for 30 years.
A.shown B.served C.brought D.given
4.The girl you saw just now _____ Little Flower.
A.is called B.to call C.called D.calling
5.I've cooked the potatoes for ten minutes,but they are still a little __.
A.easy B.difficult C.soft D.hard
6.The bad news made Mary ______.She couldn't help crying.
A.excited B.relaxed C.sad D.happy
7..You'd better start out early ____ you can make it.
A.even though B.as if C.what if D.so that
8.They are neighbors,adn they ____ each other every day;
A.see B.saw C.will see D.have seen
9.I _________ to the new museum yet,but I hope to go there this weekend.
A.have been B.haven't been C.haven't gone D.have gone
10.There is a new program on TV.That's __ teenagers.
A.looked at B.stared at C.pointed at D.aimed at
11.---Can your sunglasses ____the sun?---Of course.
A.keep out B.keep from C.look out D.come out
12.The Yangtze River is one of the _____ rivers in the world.
A.most longest B.long C.longer D.longest
13.The ads in the newspaper lead some people _____ on trips to Hong Kong.
A.to go B.go C.went D.going
14.______ you work hard,you will pass the exam.
A.Where B.If C.Because D.When
15.---How do you feel about the film?
---It is very ______.I have seen it for three times.
A.surprising B.frustrating C.exciting D.boring

英语语法问题
,my best friend [to start] for the West to make my fortune,we agreed we would meet here again exactly twenty years from that date and time.这里为什么用to start
Twenty years ago tonight,when I said goodbye to J,my best friend [to start] for the West to make my fortune,we agreed we would meet here again exactly twenty years from that date and time.

高一英语名词性从句.They are teachers and don't realize ____ to start and run a company .
1.They are teachers and don't realize ____ to start and run a company .A.what takes it B.what they took C.what it takes D.what takes them
2.Will you see to ____you brother is OK at home while we are out on work .A.this if B.it that C.it whether D.that whether 3.When woken up ,he found he was standing on _____ seemed to be a small piece of rock.