Past Perfect, Past Continous and Present Continous

So, today i will show you another tenses that you should know.


Present Continous

FORM
am/is/are + present participle

Example:

-You are watching TV.
-Are you watching TV?
-You are not watching TV.

Uses:
Now
Use the Present Continuous with Normal Verbs to express the idea that something is happening now, at this very moment. It can also be used to show that something is not happening now. Example

-You are learning English now.
-You are not swimming now.
-Are you sleeping?
-I am sitting.
-I am not standing.

Longer Actions in Progress Now
In English, "now" can mean: this second, today, this month, this year, this century, and so on. Sometimes, we use the Present Continuous to say that we are in the process of doing a longer action which is in progress; however, we might not be doing it at this exact second.
Example

-I am studying to become a doctor.
-I am not studying to become a dentist.
-I am reading the book Tom Sawyer.

Near Future
Sometimes, speakers use the Present Continuous to indicate that something will or will not happen in the near future.
Example

-I am meeting some friends after work.
-I am not going to the party tonight.
-Is he visiting his parents next weekend?

Past Continous

FORM
was/were + present participle
Example

-You were studying when she called.
-Were you studying when she called?
-You were not studying when she called.

Uses: Interrupted Action in the Past
Use the Past Continuous to indicate that a longer action in the past was interrupted. The interruption is usually a shorter action in the Simple Past. Remember this can be a real interruption or just an interruption in time.
Example

-I was watching TV when she called.
-When the phone rang, she was writing a letter.
-While we were having the picnic, it started to rain.
-What were you doing when the earthquake started? 

Specific Time as an Interruption
the Past Continuous is interrupted by a shorter action in the Simple Past. However, you can also use a specific time as an interruption.
Example

-Last night at 6 PM, I was eating dinner.
-At midnight, we were still driving through the desert.

-Yesterday at this time, I was sitting at my desk at work.

Parallel Actions
When you use the Past Continuous with two actions in the same sentence, it expresses the idea that both actions were happening at the same time. The actions are parallel.
Example

-I was studying while he was making dinner.
-While Ellen was reading, Tim was watching television.
-Were you listening while he was talking? 

Past Perfect

FORM
had + past participle
Example

-You had studied English before you moved to New York.
-Had you studied English before you moved to New York?
-You had not studied English before you moved to New York.

Uses: Completed Action Before Something in the Past
The Past Perfect expresses the idea that something occurred before another action in the past. It can also show that something happened before a specific time in the past.
Example

-I had never seen such a beautiful beach before I went to Kauai.
-I did not have any money because I had lost my wallet.
-Tony knew Istanbul so well because he had visited the city several times.
-Had Susan ever studied Thai before she moved to Thailand?

Duration Before Something in the Past (Non-Continuous Verbs)
With Non-Continuous Verbs and some non-continuous uses of Mixed Verbs, we use the Past Perfect to show that something started in the past and continued up until another action in the past.
Example

-We had had that car for ten years before it broke down.
-By the time Alex finished his studies, he had been in London for over eight years.
-They felt bad about selling the house because they had owned it for more than forty years.

Thats all tenses that i can show you. If this item is not help you that much, you can search in Google to find other trusted website. Thank You!