1. Simple past

- express an action, event... happen and completely finish in the past

2. Present perpect tense

- for something that started in the past and continues in the present:

+ ex: They’ve been married for nearly fifty years.

Note: We normally use the present perfect continuous for this:

- for something we have done several times in the past and continue to do:

+ ex: I’ve played the guitar ever since I was a teenager.

=> We often use a clause with <em>since </em>to show when something started in the past:

- when we are talking about our experience up to the present:

Note: We often use the adverb <em>ever </em>to talk about experience up to the present:

- for something that happened in the past but is important at the time of speaking:

+ ex: I can’t get in the house. I’ve lost my keys.
=> Some adv: since, for, already, ever, never, yet, lately, recently, so far = up to now = untill now, just, before, so long, several times, this/ it is the first/ second/... time,......

P/s: Wish this will be useful with U

The 'past tense' ('Past Simple') form is used to say what happened/finished in a time before now.

e.g. 'Yesterday I ate three big bars of chocolate.'

The 'past perfect' tense is used to show that an action had already finished before something else that also happened in the past. In other words, there are two events in the past, and one happened before the other.

PAST PERFECT FORM: had + (past participle).

e.g., 'I was very ill yesterday afternoon. I think this was because I had eaten three bars of chocolate at lunch time!' 

The 'past tense' ('Past Simple') form is used to say what happened/finished in a time before now.

e.g. 'Yesterday I ate three big bars of chocolate.'

The 'past perfect' tense is used to show that an action had already finished before something else that also happened in the past. In other words, there are two events in the past, and one happened before the other.

PAST PERFECT FORM: had + (past participle).

e.g., 'I was very ill yesterday afternoon. I think this was because I had eaten three bars of chocolate at lunch time!'