Explain the difference between past time focus and present time focus

The difference between past time focus and present time focus is that present time refers to the moment we are living in, the moment we are going through now. The past time focus is that we are paying attention to the things that we have experienced in the past. So, the basic difference is the one things is about being focused on present situation while other is thinking about past situations or experiences.

Explanation:

For example:

PAST TIME FOCUS: David has got good marks and he is thinking about his that achievement of good grades.

PRESENT TIME FOCUS: David has got good marks but now he is facing a problem in his studies so instead of thinking about his past achievement, he is focusing on the reason behind his current problem.