Answer the questions in a. Use the present perfect + for or since.
I've been married for 20 years.
1 I
I was a child.
2 She
three years.
3 I
a long time.
4 He
1990.
5 I
May.
6 It
1973.
7. We
8 He
2008. about two years.

1. I have been a child.
Explanation: We use the present perfect with "for" to indicate an action or state that started in the past and continues up to the present. In this case, being a child is a state that started in the past and continued until now.

2. She has been married for three years.
Explanation: We use the present perfect with "for" to indicate a period of time that started in the past and continues up to the present. In this case, the period of time is three years, which started in the past and has continued until now.

3. I have been waiting for a long time.
Explanation: We use the present perfect with "for" to indicate a period of time that started in the past and continues up to the present. In this case, waiting is the action that started in the past and has continued until now.

4. He has lived here since 1990.
Explanation: We use the present perfect with "since" to indicate a specific point in time in the past when the action started and continues up to the present. In this case, the specific point in time is 1990, when he started living here, and he continues to live here until now.

5. I have known her since May.
Explanation: We use the present perfect with "since" to indicate a specific point in time in the past when the action started and continues up to the present. In this case, the specific point in time is May, when I started knowing her, and I continue to know her until now.

6. It has been raining since 1973.
Explanation: We use the present perfect with "since" to indicate a specific point in time in the past when the action started and continues up to the present. In this case, the specific point in time is 1973, when the rain started, and it continues to rain until now.

7. We have been friends for a long time.
Explanation: We use the present perfect with "for" to indicate a period of time that started in the past and continues up to the present. In this case, the period of time is a long time, which started in the past and has continued until now.

8. He has been working here for about two years.
Explanation: We use the present perfect with "for" to indicate a period of time that started in the past and continues up to the present. In this case, the period of time is about two years, which started in the past and has continued until now.