意大利语词汇学习：意大利语介词 A
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The Italian preposition a can mean "to," "at," or "in," depending on how you use it in context. You will need preposition a in the following cases:
1. To express the idea of going somewhere or staying somewhere (with names of cities):
Vado a Milano. (I go to Milan.)
Vado al mercato ogni lunedì. (I go to the market every Monday.)
Si trova a Venezia. (It can be found in Venice.)
Si trova alla piazza. (It can be found in the plaza.)
2. Before direct objects:
Scriva a Rita. (He/she writes to Rita.)
Scriviamo alla zia. (We write to our aunt.)
Telefono agli amici. (They call their friends.)
3. The preposition a is also used with several verbs. Often those are verbs of motion, but in other instances it's a case of usage. That means either you'll have to commit them to memory, or, more likely, you'll grow accustomed to the usage over time as you listen and read Italian:
andare a... (to go to)
fermarsi a... (to stop)
incoraggiare a... (to encourage)
invitare a... (to invite to)
insegnare a... (to teach)
原文来源： 意大利语词汇学习：意大利语介词 A
riuscire a... (to be careful)
venire a... (to come to)
4. To form several grammatical constructions with particular significance:
a mezzogiorno (at noontime)
alle tre (at three)
barca a vela (sailboat)
sedia a rotelle (wheelchair)