1. The Prime minister was not coming here.
The sentence is changed to past continuous tense by replacing the present continuous tense "is not coming" with the past continuous tense "was not coming". This indicates that at a specific time in the past, the Prime Minister had no plans to come here.

2. Mohan was getting ready to go to the party.
The sentence is changed to past continuous tense by replacing the present continuous tense "is getting ready" with the past continuous tense "was getting ready". This indicates that in the past, Mohan was in the process of preparing himself to attend the party.

3. She was going to marry Mr. Nikhil.
The sentence is changed to past continuous tense by replacing the present continuous tense "is going to marry" with the past continuous tense "was going to marry". This indicates that in the past, it was planned or arranged for her to marry Mr. Nikhil.

4. When were you going to bed?
The sentence is changed to past continuous tense by replacing the present continuous tense "are you going to bed" with the past continuous tense "were you going to bed". This indicates that at a specific time in the past, the speaker was asking about the person's plan or intention to go to bed.

Explanation:
The past continuous tense is used to talk about actions or events that were in progress at a specific time in the past. It is formed by using the past tense of the verb "to be" (was/were) followed by the present participle (-ing form) of the main verb.

- The Prime minister was not coming here: This suggests that at a specific time in the past, the Prime Minister had no intention of coming to this location. It indicates a past action or plan.

- Mohan was getting ready to go to the party: This indicates that Mohan was in the process of preparing himself to attend the party at a specific time in the past. It shows an ongoing action in the past.

- She was going to marry Mr. Nikhil: This suggests that in the past, there was a plan or arrangement for her to marry Mr. Nikhil. It indicates a future action from the past perspective.

- When were you going to bed?: This implies that the speaker is asking about the person's plan or intention to go to bed at a specific time in the past. It shows an ongoing action in the past.

In summary, the past continuous tense is used to describe ongoing actions or events in the past. It helps to indicate the time frame or context in which the actions or events occurred.

The prime Minister hadn't came here