Jim （）in a factory .He （）there for three years .（work） My mother（）a teacher .She1.Jim （）in a factory .He （）there for three years .（work）2.My mother（）a teacher .She （）a teacher for twenty years .（be）3.The city

Jim （）in a factory .He （）there for three years .（work） My mother（）a teacher .She1.Jim （）in a factory .He （）there for three years .（work）2.My mother（）a teacher .She （）a teacher for twenty years .（be）3.The city
Jim （）in a factory .He （）there for three years .（work） My mother（）a teacher .She
1.Jim （）in a factory .He （）there for three years .（work）
2.My mother（）a teacher .She （）a teacher for twenty years .（be）
3.The city（）a lot since I came here .（improve）
4.My brother liker（）He （）for two hours.（swim）
5.A:How long （）you （）in the football club B:For two years.
A:When（）you ( ) the English club B:Two weeks ago .(join ,be)
6.It（）/（）（）7 years since he came to Beijing（be）

Jim （）in a factory .He （）there for three years .（work） My mother（）a teacher .She1.Jim （）in a factory .He （）there for three years .（work）2.My mother（）a teacher .She （）a teacher for twenty years .（be）3.The city

works...has worked

is..has been

has improved

swimming...has swum

have...been
did.join

is / has been

你好

1. works                    have worked

2. is                          has been

3. has been improved

4. swimming                  has swum

5. have            been

   did          join

6. is       has been

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祝你学习进步，更上一层楼！

不明白请及时追问，满意敬请采纳，O(∩_∩)O谢谢~~

1 works has been working
2.is has been
3.has improved
4. swimming has been swimming
5. have been
did join
6.It（is）/（has）（been）7 years since he came to Beijing（be）