关于dareshe is a bit shy and ___ answer teacher's question in

关于dare
she is a bit shy and ___ answer teacher's question in class.
doesn't dare to
我想问to可不可以省略.
有的说在否定句中 dare做行为动词的时候 to是可以省略的.
但是 不确定.

"to" = preposition,and prepositions links nouns,pronouns and phrases to other words in a sentence.The word or phrase that the preposition introduces is called the object of the preposition.
Therefore,adding the preposition is used as a more formal method to introduce "answer the teacher's question in class." 如果你想不用TO,也可以,但是这就是比较COLLOQUIAL 的方式来讲话.
一下的是可以用TO的情况：
–preposition
1.(used for expressing motion or direction toward a point,person,place,or thing approached and reached,as opposed to from):They came to the house.
2.(used for expressing direction or motion or direction toward something) in the direction of; toward:from north to south.
3.(used for expressing limit of movement or extension):He grew to six feet.
4.(used for expressing contact or contiguity) on; against; beside; upon:a right uppercut to the jaw; Apply varnish to the surface.
5.(used for expressing a point of limit in time) before; until:to this day; It is ten minutes to six.We work from nine to five.
6.(used for expressing aim,purpose,or intention):going to the rescue.
7.(used for expressing destination or appointed end):sentenced to jail.
8.(used for expressing agency,result,or consequence):to my dismay; The flowers opened to the sun.
9.(used for expressing a resulting state or condition):He tore it to pieces.
10.(used for expressing the object of inclination or desire):They drank to her health.
11.(used for expressing the object of a right or claim):claimants to an estate.
12.(used for expressing limit in degree,condition,or amount):wet to the skin; goods amounting to $1000; Tomorrow's high will be 75 to 80°.
13.(used for expressing addition or accompaniment) with:He added insult to injury.They danced to the music.Where is the top to this box?
14.(used for expressing attachment or adherence):She held to her opinion.
15.(used for expressing comparison or opposition):inferior to last year's crop; The score is eight to seven.
16.(used for expressing agreement or accordance) according to; by:a position to one's liking; to the best of my knowledge.
17.(used for expressing reference,reaction,or relation):What will he say to this?
18.(used for expressing a relative position):parallel to the roof.
19.(used for expressing a proportion of number or quantity) in; making up:12 to the dozen; 20 miles to the gallon.
20.(used for indicating the indirect object of a verb,for connecting a verb with its complement,or for indicating or limiting the application of an adjective,noun,or pronoun):Give it to me.I refer to your work.
21.(used as the ordinary sign or accompaniment of the infinitive,as in expressing motion,direction,or purpose,in ordinary uses with a substantive object.)
22.Mathematics.raised to the power indicated:Three to the fourth is 81 (34 = 81).