German language being very popular in many countries, it is important to know the language. So, take a first step for learning German language by starting with these simple sentences.
To acknowledge someone
English: Hi!/Hello!
German: Hallo! / Hallo!
English: Good morning/afternoon/night/day!
German: Guten Morgen / Tag / Nacht / Tag!
With strangers
English: Nice weather we have today; don't you think so?
German: Schönes Wetter haben wir heute, nicht wahr, so zu denken?
English: So, do you come here often?
German: Also, kommst du öfter hier?
English: Excuse me. You look very familiar. Have we met somewhere before?
German: Entschuldigen Sie mich. Du siehst sehr vertraut ist. Kennen wir uns irgendwo vor?
English: Excuse me. Can you tell me what time it is?
German: Entschuldigen Sie mich. Können Sie mir sagen, wie spät es ist?
With acquaintances/friends
English: Hey! It's been quite some time.
German: Hey! Es ist seit geraumer Zeit.
English: How are you?
German: Wie geht es Ihnen?
English: Looking good!/You look great!
German: Sieht gut aus! / Du siehst toll aus!
English: What a pleasant surprise! I didn't expect to see you here.
German: Was für eine angenehme Überraschung! Ich hatte nicht erwartet, dich hier zu sehen.
Introductory sentences
English: Pleased to See You
German: Freuen uns auf Sie
English: What is your name?
German: Wie ist Ihr Name?
English: My name is…..
German: Mein Name ist ... .
English: What is it?
German: Was ist das?
English: Where is it?
German: Wo ist es?
At the restaurant
English: May I have (a cup of) coffee, please.
German: Darf ich (eine Tasse) Kaffee, bitte.
English: Do you have iced tea?
German: Haben Sie Eistee?
English: Is there a table available for four people?
German: Gibt es einen Tisch für vier Personen?
English: Can I get the bill?
German: Kann ich die Rechnung?
While shopping
English: How much does it cost?
German: Wie viel kostet es?
English: It is very costly
German: Es ist sehr teuer
English: I wish to replace the currency
German: Ich möchte die Währung ersetzen
In general
English: Thank you very much
German: Vielen Dank
English: What is the time, please?
German: Was ist die Zeit, bitte?
English: I didn’t understand
German: Ich verstand nicht,
English: I love this country
German: Ich liebe dieses Land
English: I have come from… (America/UK, etc.)
German: Ich bin gekommen, ab dem ... (Amerika / UK, etc.)
English: Where do you stay?
German: Wo wohnst du?
Inquiring for directions
English: Where is the train station?
German: Wo ist der Bahnhof?
English: How to arrive at the airport?
German: Wie am Flughafen ankommen?
English: Where can I get a taxi?
German: Wo bekomme ich ein 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. 
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When invited for dinner in France it is important to dress well, as the French are very fashion conscious 