This article is for Hindi medium students; who face problem in English conversation  in past tense. If you go through this article. Then I assure you that you can teach others about past tense.

1.तुमने लिखा।=S+V (S=subject, V=verb, O=Object)
2.तुमने पत्र  लिखा। =S+O+V
3.तुमने एक  पत्र  लिखा। S+O+V
4.तुमने कल एक  पत्र  लिखा। S+O+V

1.तुमने लिखा।=You wrote.S+V
2.तुमने पत्र  लिखा। =You wrote letter.S+V+O
3.तुमने एक  पत्र  लिखा।=You wrote a letter. S+V+O
4.तुमने कल एक  पत्र  लिखा।=You wrote a letter yesterday. S+V+O


In this video the learning for conversation has started very simply. Ii is very interesting.In Hindi verb never changes its look. See these examples.
तुमने लिखा
मैंने  लिखा
उसने  लिखा
वे सबने  लिखा
हम सबने  लिखा
मोहन ने लिखा
In above sentences it has been noticed that the verb in a particular sentences never changes even if subjects or objects are changed.

See also  Countable and Uncountable Noun Singular and Plural Class 2 Hindi Lecture 2ND VIDEO