36. it' s very important to keep the environment clean
37. it's boring to talk to him
38. ......enough to see that film
39. it's difficult to speak eg well
to speak eg well is difficult
41. we enjoy going fishing
42. the lesson is so long that we can't finish it
63. ba spent an hour doing the homework
64. she told Ba to learn by heart vocab at home
57. they enjoy sitting in the morning sunlight
58. it's the first time i hace seen that man