choose the right form of the verb :1 I (read /

Choose the right form of the verb :
1 I (read / reads ) books in the evening
2 you ( play/ plays) tennis on Sunday
3. The children ( pick/ picks) grapes and pears
4.My sister often (write/ writes) letter to our granny
5.Angela (help/helps) her granny in the kitchen.
6.They )eat/eats) pears, plums,and nuts.
7.Nick (go/ goes) to the forest in summer.

И можно в 2-ух словах почему так...ребёнку хоть разъяснить....Заблаговременно спасибо !