помогите определить время предложений и перевод

1) ALEX LOOKs SAD. He must has heard some bad news. (Perfect, Present)
2) Richard and Paul didn't attend any parties since they came back home.
3) Jane catched a bad cold last weekend. She was ill several times this term.(Simple, Past)
4) Pat played a lot of tennis in the last two months.(Simple, Past)
5) This is the first time Miss Ross has arrived in Germany. (Perfect, Present)
6) Alex is an artist. He has drawn three beautiful landscapes recently.(Perfect, Present) Last week he drew a small seascape.(Simple, Past)
7) Did you buy the dictionary I told you about? (Simple, Past)
-Yes.
- When did you buy it? (Simple, Past)
8) So far Jill has sewed three nice blouses. (Perfect, Present)
9) I knew Archy all my life. I got acquainted with him when we were four. (Simple, Past)
10) Paul Newman says he has seen snow for the first time last February. He says he has never seen snow before. (Perfect, Present)
11) Bruce wore his new fashionable tie only once since he bought it. He wore it to our party last Saturday night. (Simple, Past)
12) Kathy just has phoned. She wants you to phone her back.(Perfect, Present)
13) The 2004 Olympics were In Athens, Greece. (Simple, Past)
14) The information technology revolution has transformed our lives in many ways, making it easier to communicate WITH EACH OTHER. (Perfect, Present)

На мой взгляд, в ответе Slovenka много ошибок.

Мой вариант:

1) Alex looks sad. He must HAVE heard some bad news. 2) Richard and Paul have not attended any parties since they came back home. 3) Jane caught (to catch – неправильный глагол) a bad cold last weekend. She has been ill several times this term. 4) Pat has played a lot of tennis in the last two months. 5) This is the first time Miss Ross has arrived in Germany. 6) Alex is an artist. He has drawn three beautiful landscapes recently. Last week he drew a small seascape. 7) Have you bought the dictionary I told you about? -Yes. - When did you buy it? So far Jill has sewn three nice blouses. 9) I have known Archy all my life. I got acquainted with him when we were four. 10) Paul Newman says he saw snow for the first time last February. He says he never has seen snow before. 11) Bruce has worn his new fashionable tie only once since he bought it. He wore it to our party last Saturday night. 12) Kathy has just phoned. She wants you to phone her back. 13) The 2004 Olympics were in Athens, Greece. 14) The information technology revolution has transformed our lives in many ways, making it easier to communicate with each other.

Примечание:

10) Paul Newman says he saw snow for the first time last February. He says he has never seen snow before.

Если рассматривать эти два предложения как контекст, целостную ситуацию, правильнее было бы : He says he had never seen snow before (he saw it last February). Но условие задания предлагает на выбор только Past Simple или Present Perfect.