shall, can, could?

HOW CAN I USE SHALL OR COULD OR CAN IN QUESTION?
PLEASE CAN YOU EXOLAIN THAT TO ME ?

Hello, we’d really like to answer your question and since it’s a very broad one, it would be great where exactly you found those three words? How do you know these words exist? Many thanks, Torsten
PS: Please stop SHOUTING: english-test.net/community/i … uting_mean[YSaerTTEW443543]

TOEIC listening, photographs: Reconstruction[YSaerTTEW443543]