Despite the main language being Arabic most Moroccans persist in speaking French which goes back to the colonial days when they were forced to speak it . 

Thank you : Merci[french] :

Choukran: thank you [arabic] :

Bonjour :good day[french]: 

Hello : Assalam alikoum (arabic moroccan)

Sorry : Pardon,[french]

Please :  âfak (arabic moroccan)

Excuse-me: Smahli âfak (arabic moroccan)

Good bye : Besslama  

good morning : sabbah elkhir 

good night :massaa elkhir

marhba bikoum =  you are welcome : [Fr] vous etes les bienvenus

Other useful phrases:

Labass? = How are you?

Labass ! = I'm fine (yes, the response is the same as the question)

Al-hamdu-lillah = I'm fine (literally, Praise be to god)

Feen...? = Where is ...?

Shehal taman? = How much (price)?

No = La

Yes = Naam or Iyeh or Aiwa

Seer (or Seer f'halek) = go away

Hashouma = shame on you