Past Continuous Tense: This tense is used to express actions or events happened in the past and when this action or event was interrupted in the past.
The suffixes of the present continuous tense and simple past tense are used in combination to form this tense.
It can be translated into english as "was/were ...ing"

Future in the Past: This tense is used to express the future from the perspective of past tense.
The suffixes of the future tense and simple past tense are used in combination to form this tense.
It can be translated into english as "was/were going to"

Future in the Past (2): This tense is used to express actions or events that constantly, regularly happened in the past, such as habits.
The suffixes of the present tense and simple past tense are used in combination to form this tense.
It can be translated into english as "would".

Necessitative Past Tense: This tense is used to express actions or events that should have happened in the past.
The suffixes of the necessitative mood and simple past tense are used in combination to form this tense.
It can be translated into english as "should have".

Conditional Past Tense: This tense is used to express wishes or regrets.
The suffixes of the subjunctive or optative mood and simple past tense are used in combination to form this tense.
It can be translated into english as "if only".

Pluperfect: This tense is used to express an action or event that was completed before a remarkable moment that is implied
The suffixes of the reported past tense and simple past tense are used in combination to form this tense.