66 - 67 : my hobby is colecting glass bottles 

-> my hobby + is + V-ing : dùng để giới thiệu về sở thick của mk 

68 - 69  : what is your favourite hobby , elana ? 

-> what is your favourite hobby + S : dùng để hỏi về sở thik của 1 ai đó 

70 - 71 ; my sister finds arranging flowers is interesting 

-> cách làm giống câu 66 - 67 ạ 

72-73 : linh  doesn't like playing board games 

-> thì HTĐ 

-> like + V-ing 

73 - 74 : what  about going swimming? 

-> wha about + V-ing 

75 - 76 : lan's  school has a big library

-> thì HTĐ 

77 - 78 : How much does this car cost?

-> thì HTD D

79 - 80 : what lovely weather today is 

66-67.  My hobby is collecting glass bottles.

S+find st interesting: thấy thứ gì đó thú vị.

= S(dưới dạng TTSH) hobby+be+ sở thích

68-69. What's your favourite, Elena?

What hobby+S+do/does+like?

= What+be+S(dưới dạng TTSH)+favorite?

70-71. My sister finds arranging flowers relaxing.

S+think+(that)+st+be+ adj = S+find+ st+adj

72-73. Linh doesn't like playing board games.

find st boring= do/does not like st

74-75. How about going swimming?

Why don't+we+V? = How about+Ving?

76-77. Lan's school has a big library.

There is +a/an+N+in/at/on/...+ địa điểm= Địa điểm+have/has+a/an+N

78-79. How much does this car cost?

How much is/are+N? = How much+do/does+N+cost?

80. What a lovely weather!

How+adj+N+is!=What+a/an+N!