whether I can use either one

I don’t know when to use can, could, may, might, want, would like, this, that etc. Please teach me. Thanks in advance.

You might want to start by reading this: I wish to know about “Modal verbs”[YSaerTTEW443543]

TOEIC listening, photographs: Mailing letters[YSaerTTEW443543]

Hi, Torsten, thank you for your explanation about modal verb. Thank you.