1. The children can water flower and trees
The children can go shopping.
The children can help elderly people
The children can do tricks/housework
The children can collect secondhand books
The children can wash off graffiti
The children can rake leaves and garbage
The cgildren can sweep paths
2. clean-cleaned-cleaned
bring-brought-brought
draw-drew-drewn
learn-learnt-learnt
do-did-done
cut-cut-cut
go-went-gone
sew-sewed-sewed
sweep-swept-swept
sing-sang-sung-ride-rode-ridden
buy-bought-bought