Want to watch a movie with lots of Spanish sentences or have to visit Spanish speaking nation for a business meet? Whatever may be the reason, if you are willing to learn Spanish, you have to definitely start with some of these Spanish sentences.
To acknowledge someone
English: Hi!/Hello!
Spanish: Hola / Hello!
English: Good morning/afternoon/night/day!
Spanish: Buenos días / tarde / noche / día!
With strangers
English: Nice weather we have today; don't you think so?
Spanish: Buen clima que tenemos hoy, ¿no te parece?
English: So, do you come here often?
Spanish: Entonces, ¿usted viene aquí a menudo?
English: Excuse me. You look very familiar. Have we met somewhere before?
Spanish: Disculpe. Te ves muy familiar. ¿Nos conocemos en alguna parte antes?
English: Excuse me. Can you tell me what time it is?
Spanish: Disculpe. ¿Puede usted decirme qué hora es?
With acquaintances/friends
English: Hey! It's been quite some time.
Spanish: Hey! Ha sido bastante tiempo.
English: How are you?
Spanish: ¿Cómo estás?
English: Looking good!/You look great!
Spanish: Verse bien! / Te ves muy bien!
English: What a pleasant surprise! I didn't expect to see you here.
Spanish: ¡Qué grata sorpresa! No esperaba verte aquí.
Introductory sentences
English: Pleased to See You
Spanish: Encantado de Ver
English: What is your name?
Spanish: ¿Cuál es su nombre?
English: My name is…..
Spanish: Mi nombre es ... ..
English: What is it?
Spanish: ¿Qué es?
English: Where is it?
Spanish: ¿Dónde está?
At the restaurant
English: May I have (a cup of) coffee, please.
Spanish: ¿Puedo tener (una taza de) café, por favor.
English: Do you have iced tea?
Spanish: ¿Tiene el té helado?
English: Is there a table available for four people?
Spanish: ¿Hay una mesa para cuatro personas?
English: Can I get the bill?
Spanish: ¿Puedo obtener el proyecto de ley?
While shopping
English: How much does it cost?
Spanish: ¿Cuánto cuesta?
English: It is very costly
Spanish: Es muy costoso
English: I wish to replace the currency
Spanish: Quiero sustituir la moneda
In general
English: Thank you very much
Spanish: Muchas gracias
English: What is the time, please?
Spanish: ¿Cuál es el tiempo, por favor?
English: I didn’t understand
Spanish: Yo no entendía
English: I love this country
Spanish: Me encanta este país
English: I have come from… (America/UK, etc.)
Spanish: Vengo de ... (América / Reino Unido, etc)
English: Where do you stay?
Spanish: ¿De dónde te quedas?
Inquiring for directions
English: Where is the train station?
Spanish: ¿Dónde está la estación de tren?
English: How to arrive at the airport?
Spanish: Cómo llegar al aeropuerto?
English: Where can I get a taxi?
Spanish: ¿Dónde puedo conseguir un taxi?
You need not be an expert at languages and cultures, but sometimes it proves important to learn some basics about the country you are visiting, just for the simple reason of SURVIVING!!
In Italy the customary handshake with direct eye contact and a smile proves sufficient between strangers. 
Germany is famous for its sausages. They have a variety of at least 1,500 varieties available.
When invited for dinner in France it is important to dress well, as the French are very fashion conscious 