Hello - konnichiwa
          or ossu(when talking to a close male friend)
          or moshi moshi(when talking on the phone)

Goodbye - say?nara

Where's the toilet? - benjo wa doko desu ka?
                              or toire wa doko desu ka?
                              or tearai wa doko desu ka?

This gentleman/lady will pay for everything - konohito ga zembu haraimasu

I love you - suki desu or suki da or suki dayo or suki yo or daisuki desu or aishiteru yo

There's a problem in the room - sono heya no naka ni mondai ga arimasu

When should I vacate the room? - itsu, heya o denakute wa narimasen ka?

I think there's a mistake on this bill - kono seiky?sho ni machigai ga aruy? ni om? no desu ka?

Leave me alone! - hottoite!

Help! - tasukete!

Fire! - kaji da!

Call the police! - keisatsu o yonde kudasai!

My hovercraft is full of eels - Watashi no hob?kurafuto wa unagi de ippai desu.

I'm looking for SuperRob. - SuperRob wo sagashite imasu.

I like Japanese - Watashi wa nihongo ga suki desu.

Say hi to SuperRob for me - John ni yoroshiku to tsutaete kudasai.

How Do You Say "Please" In Japanese? - “Please” wa nihongo de nanto iimasu ka?

More to be posted soon lol

lol I didn't notice I wrote John same as the book said lol