Составить по два предложения во временах презент перфект, паст симпл, паст прогрессив

Past Simple
I went to the park yesterday
I studied in China in 2001
Present Perfect
I've never gone to the park
I haven't been to China yet

1 Where are you hurrying now?

2 When I came to Peter, he was playing chess with his father.

3 Come around at 7:00 today. I will be waiting for you.

4 I can't meet you tomorrow. My mother is arriving soon.

5 The rain started while I was standing at the bus stop.

6 Students always try to pass exams successfully.

7 When you reach London, I will reach the airport.

8 Are you discussing the plans now?

9 She wears spectacles because of the problems with her eyes/eyesight.

10 If I have some spare time, I will see you off by all means.

11 I hate the autumn. It's getting colder and colder.

12 My friend entered university last year.

P.S. В некоторых местах оригинального текста были грамматические, синтаксические и орфографические ошибки. Они исправлены, но если не хотите долгих разговоров с преподом, оставьте всё, как было :)))

Объяснение:

1. Разделительный вопрос к предложению: Giant pandas are members of the bear family, and they are mammals.
Giant pandas are members of the bear family, aren't they?
2. Вопрос к подлежащему к предложению: Giant pandas must eat a lot of bamboo everyday to get enough nourishment.
Who must eat a lot of bamboo everyday to get enough nourishment?
3. Альтернативный вопрос к предложению: Female giant pandas usually give birth to twins. 
Do female giant pandas usually give birth to twins or triplets (тройня)?
4. Специальный вопрос к предложению: It (baby giant panda) starts to learn how to walk when it is about three or four months old. 
When does it (baby giant panda) start to learn how to walk?
5. Общий вопрос к предложению: Mother giant pandas look after their babies for about 18 months.
Do mother giant pandas look after their babies for about 18 months?