Although, people are usually more lenient with spoken English, it’s still not an excuse not to let go of old bad grammar constructions you formed the habit of saying. Click on the link below to see the full list. Here are our favorites:
“They enjoyed the baseball game despite of the rain.”
“Everybody are happy.”
“She asked me where do I work.”
“I need to finish this project until Friday.”
“If I will see John later, I’ll give him the message.”
via 15 Common Grammar Mistakes in Spoken English.