21. The film was boring enough to watch till the end
S + be + adj + enough + to V
22. The house on the corner isn't too cheap for us to buy
S + be + too + adj + for sb + to V
23. I spend one hour and a half drving my children to school
S + spend + time + V_ing
24. She is interested in taking photos of her children
be interested in + V_ing
25. Taro is keen on reading books
be keen on + V_ing = like
26. It took them half an hour to walk to the bus stop
It + takes + O + time + to V
27. You should not spend waste time time hanging out with him
S + spend + time + V_ing
28. Girls often spend waste hours buying new clothes
S + spend + time + V_ing
29. What about having a cup of tea?
What about + V_ing?
30. How about going to the cinema together?
How about + V_ing?