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-Time expressions:
Yesterday
Ago
Last (year/month/week/day)

-We use Verb2 for affirmative sentences, didn't + V1 for negative sentences.

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-We use past simple tense to talk about something that started and finished in the past, often with a definite time expression.
-We also use past simple tense to talk about things that happened one after the other in the past.

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-Time expression:all day/morning/evening/month/year,at nine o'clock last night,at the time,while,as, etc.
-We use were + verb ing for you/they, was +verb ing for I/he/she/it.

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-We use past continuous to talk about an action that was in progress at a particular time in the past.
-We also use it to talk about two or more actions happening at the same time in the past.Or to talk about an action that was interrupted by another action.

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-We use have been to say that somebody went to a place and has returned.
-We use have gone to say that somebody has gone to a place and hasn't returned.

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-We use "already" between have/has and verb.It means that action was completed way before.
-We use "just" between have/has and verb.It means that action happened a  moment.
-We use "yet" at the end of the sentence and we only use it with negative sentences.It means that the action didn't happen at the moment of speaking.

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-We use present perfect to talk about things that has happened in the past but we don't the exact time of the action.
-We use have +V3 for I/you/we/they, has + V3 for he/she/it.

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-We use don't have to for the things we are not obliged to do.
-Example:On Saturdays, we don't have to go to school.

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-We use should when we express our thoughts about something.
-Example:Marry is late again.She should run.

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-We use have to and must to express obligation. There is a slight difference between the way we use them.
-"Have to" is a more formal."Have to" normally comes from an outside speaker or the things we are obliged to do like our homework.

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-We use cannot and mustn't when we talk about something that is against the rules, specially when we didn't make the rules.
-Mustn't is more common on public signs and notices informing people of rules and laws.

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-We use can, could and may to ask for permission.
-Could is more formal and polite than can.
-And may is the most formal way to ask for permission.

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-We use could for general ability.But if you want to say that somebody did something in a specific situation, use was\were able to or manage to.
-Example:The fire spread through building very quickly but fortunately everybody was able to escape.(not could escape.)

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Here is a video about comparative and superlative

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Here is a video about comparative and superlative

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https://youtu.be/wwLaiF_bVpI

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-We use as...as to make comparisons when the things we are comparing are equal in some way.
-We use the base form of adjective\adverb.

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-We use superlative to compare more than 2 things.
-We add "-est" to the word if it's 2 or shorter than 2 syllables.
-We add "most" to the front of the word if it's more than 2 syllables.
-We always use "the" before every word.

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-We use comparative to compare just two things.
-We add "-er" to the word if it's 2 or shorter than 2 syllables.
-We add "more" to the front of the word if it's more than 2 syllables.
-We always use "than" after every word.

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Mike had jogged before he ate burger.

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before, after,when,by the time, already,as soon as,until,ever,never

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-AFTER HAD3,2 (3 means the third form of the verb.2 means the second event which we use in past simple so it is the second form of the verb.)
-BEFORE 2,HAD 3
BY THE TIME 2, HAD 3
WHEN 2,HAD 3

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-We use past perfect to talk about something that happened in particular time in the past.
-We also use it to talk about events that happened before the another action.