31- I learned to swim when I was very young. I was taught by my father.
32- I learned to swim when I was very young. I was taught by my father.
33- He has bought two tickets for the concert tonight. He has invited her to the theater.
34- The two girls playing chess over there are my classmates.
35- I was reading a newspaper while I was waiting for the bus this morning.
36- The number of participants is increasing every week.
37- It gets hotter and hotter in June.
38- Our little children like to be taken to the water park every Sunday.
39- I have seen the famous Phong Nha Cave three times, but I'd like to see it again.
40- I have seen the famous Phong Nha Cave three times, but I'd like to see it again.