根据题目要求完成下列任务。用中文作答。

教师教授了“过去进行时”这一语法内容，根据这一语法内容进行了如下练习活动。

Activity 1

T: Hi, what were you doing at $ p.m. yesterday?

S1: I was doing my homework.

T: Good. Ask the student behind you the same question.

S1: What were you doing at 8 p.m. yesterday?

$2: I was watching TV. What were you doing at 8 p.m. yesterday?

$3: I was cleaning my room. What were you doing at $ p.m. yesterday?

Activity 2

T: Now let's see who has the best memory. I was cooking at 6 o'clock yesterday evening.What about you?

S1: I was having dinner.

T: Tell your partner like this: Ms. Zhang was cooking at 6 o'clock yesterday evening. I washaving dinner.

S1: Ms. Zhang was cooking at 6 o'clock yesterday evening. I was having dinner.

$2: Ms. Zhang was cooking at 6 o'clock yesterday evening. S1 was having dinner. I wasdoing some shopping.

$3: ...

根据所设计的练习，回答下面三个问题。

(1)该教师设计的两个活动属于什么类型的语法操练活动?请简要说明。(6分)

(2)该设计中存在什么问题?(12分)

(3)针对存在的问题提出合理的建议。(12分)