5.Ali likes playing tennis, but I like playing boseball at the weekends
⇒C 
→S(he/she/it) + V-es/s + object
→S(you/we/they) + V-o + object
6.Metin and Sude sometimes skate
⇒B
→S(you/we/they) + V-o + object
7.Somet often goes
⇒A
→S(he/she/it) + V-es/s + object
13.The children skip rope in the park after school
⇒C
→S = children là những đứa trẻ là số nhiều nên không thêm s/es sau động từ
14.Emarh is too fat because he eats too much
⇒D
→S + V-s/es + object
15.I never don't use credit card in shopping
⇒B
→S + ADVERTISE OF FREQUENCY + V_O + object