=>
6. We think that writing essay is difficult.
-> find sth adj ~ think (that) sth is adj
7. They think that collecting old bottles is very easy.
-> find sth adj ~ think (that) sth is adj
8. He finds playing tennis very boring.
-> find sth adj ~ think (that) sth is adj
9. I think that reading comics is very useful.
-> find sth adj ~ think (that) sth is adj
10. He likes walking in the rain.
-> like Ving : thích làm gì