"It's quite small, isn't it?"
'Sochira mo nihonjin deshou ka.' 'Anata mo nihon no kata deshou ka.'
You may ask 'Dochira-sama deshou ka.'
"Iru deshou?" means "S/He's there, isn't s/he?"
A direct translation would be 'sensei deshou ka. watashi wa gakusei desu,' written in Japanese: 先生でしょうか。私は学生です。
'Doushite pachinko ga suki janai deshou ka.'
'Koko de kore wo yarimashite tanoshii deshou ka?'.
You may say "Shashin [wo] totte ii/yoroshii desu/deshou ka."
'Ofuro ga tanoshikute kiraku dakara mesu deshou?'.
since Tadashii means things like correct, and proper, i believe this would be translated into "is that right?" or "is that correct?"
You may say 'onamae wa nan desu/deshou ka,' written: お名前は何です/でしょうか
Making suggestions in Japanese can be accomplished with a number of grammatical forms. A simple and direct way is the following: "~something ha dou [desu/deshou ka]" means "how about ~something?"
"Tadashii desu" pronounced tah-dah-shee dess.