1、The park is in the centure of the city.I visited it yesterday.
The park that I visited yesterday is in the center of the city
2、The train started at 4:50p.m .I missed it.
The train that I missed started at 4:50p.m
3、I loved singers.They sing their own songs.
I loved singers who sing their own songs
4、I like the people.They are honest and clever.
I like the people who are honest and cleve