No pude leer mis correos porque (perder) mi contraseña.

Sentences
Combine the elements to form complete sentences. Use the present perfect tense ( present perfect ) and adds elements when necessary.

Model

I / always / want / an iPad
I've always wanted an iPad.

us / buy / most innovative digital camera

you / never / think / about being a mathematician

scientists / already / discover / cure

the teacher / write / formulas on the board

my parents / always / believe / in UFOs

Speech
Jorge Báez, a doctor dedicated to genetics, has received an award for his work. Complete your thank you speech with the pluperfect.

Thank you very much for this award. I remember that before I was 12 years old I already (1) (decided) to be a doctor. Since I was little, my mother always (2) (took) me to the hospital where she worked and I remember from the first time (3) (fascinated) those doctors dressed in white. Then, on my 26th birthday, I have (4) (spent) three years studying the properties of human genes, especially since (5) (watching) a program on television about cloning. When I finished my graduate studies, I already (6) (made) great scientific advances ...

Explanation
Rewrite the sentences using the pluperfect . Follow the model.

I took a shower at 7:00. Before taking a shower I spoke with my brother.

I had already talked to my brother before showering.

I left the house at 8:00. Before leaving home I checked my email.

I got to the office at 8:30. Before arriving at the office I had a coffee.

The computer was shut down at 10:00. I saved the files at 9:55.

I went for coffee. Before, I checked that everything was fine.

Historia del mar
Complete the following encyclopedia note with the verbs conjugated in the past perfect or the pluperfect.

In December 1872, the crew of the ship Dei Gratia found the ship Marie Celeste in the Atlantic Ocean . He was sailing at full speed. But there were no people.

A month earlier, the Marie Celeste (1) (left) from New York to Genoa. He was carrying industrial alcohol. When the crew of the Dei Gratia found him, (2) (disappear) the entire crew. The lifeboat and other things (3) (disappear) too. But the alcohol was there. They could never know what happened.

Since then, people (4) (give) many explanations about the fact. Some (5) (say) that the crew left the ship because they thought it was going to sink. Others (6) (tell) exotic stories. The disappearance of the crew of the Marie Celeste is one of the most famous stories of the sea.

To complete

Complete the sentences with the correct form of the past perfect of the verbs in parentheses.

I couldn't read my emails because I (lost) my password.
I sent you a text message with the information that I (promise) you.
It was quite a challenge to create the website that my clients (ask for) me.
We never (work) with this type of program.
From her mistakes, it was evident that Marisa did not (use) the spell checker.

Change

Change the following affirmative sentences to negative sentences in the past perfect . Use the given elements and follow the model .

Model

The Internet has come to my school. (yet)
The Internet had not yet reached my school .

Miguel has repaired an MP3 player. (never)

Sonia and her brother have created a blog. (still)

I have attached the file to this email. (yet)

You have surfed the net. (never)

We have downloaded the photos to the laptop. (before)

3 - What have they done?
Combine these elements to make complete sentences. Use the perfect past tense and make the necessary changes.

us / download / programs on the net

mathematicians / discover / revolutionary formula

astronomer / observing / comet / for / hours

you / make / progress / research

engineer / patent / discovery

you / send / email

2 - The world of computers
Rewrite these sentences using the pluperfect . Follow the pattern .

Model

An hour ago I sent an email. I used the spell checker before submitting it.
I had already used the spell checker when I sent the email.

I got your text message at 5:00. I finished downloading the programs at 4:30.

I deleted the files. They called me on my cell phone five minutes later to ask them.

I saved the attachments. My computer crashed shortly after.

I took three computer science courses last year. I bought this computer the day before yesterday.

I attached some photos to the email. I lost connection a few minutes later.

1 - Scientific advances
Complete the sentences using expressions of time with doing and the past tense . Add the necessary elements.

Model

engineers / patent invention / two years
Engineers patented invention two years ago.

me / download the program / fifteen minutes

astronaut / discovering a new planet / several years

biologists / research on aquatic plants / five years

chemists / make a revolutionary discovery / one year

camera cell phones / invented / various years