Past simple or present perfect?

"I saw a movie last night."

• Includes specific time? = Past simple

• Does not include specific time? = present perfect.

"I haven't seen a movie in weeks."

• Includes specific time? = Past simple

• Includes an extended period of time? = present perfect.

Have you gone shopping recently?

• Includes "did" + "verb" = Past simple

• Includes "have"+"past participle"? = Present perfect.

Did you go shopping as I told you?

• Includes "did" + "verb" = Past simple

• Includes "have"+"past participle"? = Present perfect.

"I never had a car in my life. I only had bikes."

• Implies a finished event? = Past simple

• Implies an event that still has an effect in the present? = Present perfect.

"I have never had a car in my life. I still want one."

• Implies a finished event? = Past simple

• Implies an event that still has an effect in the present? = Present perfect.

"I studied English for three years, but I never learned anything."

• Implies a finished event? = Past simple

• Implies an event that still has an effect in the present? = Present perfect.

"I have studied English for three years. I'm still learning."

• Implies a finished event? = Past simple

• Implies an event that still has an effect in the present? = Present perfect.

Have you ever been to Paris?

• Implies a finished event? = Past simple

• Implies an event that still has an effect in the present? = Present perfect.

"I have been working on this project for two months now."

• Includes specific time? = Past simple

• Implies an event that still has an effect in the present? = Present perfect.