M: Hi, Sally.
W: Hello, Tom. How are you
M: I’m fine. Where are you going
W: Oh, I’m on my way home from work.
M: I didn’t know you had a job.
W: Yeah, I work part-time at a supermarket.
M: What do you do there
W: I work in the produce section, Trimming and wrapping fresh fruit and vegetables. I also stock shelves. Sometimes when it really gets busy, I work at the check-out counter. Have you got a job, Tom
M: Yeah, I do yard work for people. You know, cutting grass, raking leaves, pulling weeds, things like that.
W: I’d like doing that. It must be nice to work outdoors.
M: Sometimes it is. Except when it rains or snows or gets too hot or too cold or…
W: Ha-ha, I think every job has its shortcomings. There are times when I get pretty tired of carrying things around at my job. But a job’s a job. Gotta earn money for school.
M: Me, too. Tuition is very high, isn’t it Well, I must go now. I have to plant some trees for my neighbors this afternoon.
W: Well, don’ t work too hard. Holding down a job, going to class, studying. Sometimes it can become too much for one person. Take it easy.
M: You, too. It was great seeing you. Sally!

Why does Tom do the yard work（）