to和for使用时有什么区别？

To and for are similar, so it’s easy to get them confused. Both to and for are prepositions, one of the eight parts of speech, and both are used quite a lot. The difference between to and for lies in their meanings and the words they’re typically used with.We explain those meanings in the next sections, but for now let’s talk about the differences between for and to. For example, to is one of the prepositions of direction, which means it can be used to express movement, whereas for is not (except in rare cases, where one could say “I think we’re headed for a dead end,” for example). Additionally, to can indicate the infinitive form of verbs, which for cannot.Likewise, for has its own unique uses that to doesn’t have. For can sometimes act as a coordinating conjunction, meaning it can connect two clauses in a sentence, something to cannot do.Aside from their usage as prepositions and special grammar situations like infinitives and conjunctions, both to and for are also used as parts of phrasal verbs. When used in phrasal verbs, however, they no longer act independently and instead take on the meaning of that particular phrasal verb.When to use toWhen do you use to in a sentence? Here are the main uses of the preposition to:1 DirectionExpressing movement toward somethingWe’re going to the zoo this weekend.Look to the left and right when crossing the street.2 ReceivingShowing who or what receives an action or itemFurlong passed the ball to Sexton at the last second.We didn’t invite Karen because she was always mean to us.3 ConnectionShowing an abstract link between two peopleI am married to my best friend.This is Dwight, assistant to the regional manager.4 AttachmentShowing a physical attachment between two thingsThe piece of paper was accidentally glued to my hand.I chained my bike to a bench, but the bench was stolen.5 ComparisonIntroducing the second part of a comparisonHigh school is easy compared to college.They preferred water to soda.6 Reason (with verb)Describing why something happened, when the explanation uses a verbHe shouldn’t have joined the army to impress people.I study so much to get good grades.Other main uses of toInfinitives—In the infinitive form of a verb, to comes before the root verb.I want to be an astronaut.To succeed in anything requires motivation.Time—Especially in British English, to is used to mean “before” a certain time.It’s a quarter to four. (3:45)Ten minutes to closing!Synonym of “until”—To is often used colloquially as a replacement for “until.”We’re open from dawn to dusk.I’m with you to the end of the line, Bucky.When to use forWhen do you use for in a sentence? Here are the main uses of the preposition for:1 SupportIndicating agreement, allegiance, or favor toward somethingI always root for the underdog at games.If you’re not for the union, you’re against it!2 RepresentationShowing an action on behalf of or representing something elseI speak for everyone when I say that we’re happy you’re here.I may work for Walmart, but I don’t shop there.3 ExchangeIntroducing the second part of a purchase, deal, or tradeI’ll give you my potato chips for your mini-muffin.He bought the entire Skrillex discography for only a dollar.4 LengthIndicating length of time or distanceShe worked there for four years and the boss never learned her name.Go straight for a few miles and then turn left.