Diferencias: Say & tell, speak & talk

Say:
Decir, aplicado en:

• Say something (hello, goodbye)

• Say your name

• Say a prayer

Tell:
Decir, aplicado en

• Tell your name

• Tell a secret

• Tell a joke

• Tell a story
  
  
• Tell a confession

Speak:
Hablar, en los contextos:

• Speak a language

• Speak louder/lower, faster/slower

Talk:
Hablar, en los contextos

• Talk about a topic
  
  
• Talk to someone