参考答案
1．They sang a song/songs yesterday. 2．There are two trees in front of the house./There is a house in front of the trees. 3．Reading in the sun is harmful to his eyes/health/him./It’s harmful to read in the sun. 4．The apple is as delicious as the orange. 5．If he is free, he’ll climb mountains/go mountain climbing.
6．The book is worth reading./… 7．There are some apples/pears/peaches/… on the tree./There is some fruit on the tree./… 8．She was cutting paper at that time yesterday./… 9．The bridge was built in 1960./The bridge has been being built since 1960./The bridge has been built since 1960 and is now completed./… 10．He should wear a helmet when riding a bike./…
11．The girl is playing the guitar now. 12．I did the dishes yesterday. 13．Alice has longer hair than Mary. 14．There are keys on the chair. 15．I will study hard so that I can get good grades.
16．She has long hair. 17．The bank is across from the bookstore. 18．They are playing chess now. 19．They went fishing last weekend. 20．You had better put on your coat because it is snowing.
21．The boys are good at singing songs. 22．The girl was cooking at this time yesterday. 23．The football is as cheap as the basketball. 24．It’s important for us to save water. 25．The box is so heavy that he can’t carry it.
26．The boy looks happy. 27．They are cleaning the classroom now. 28．My brother can draw beautiful pictures. 29．They are going to have a picnic tomorrow. 30．The boy was doing his homework while his mother was reading./The boy is doing his homework while his mother is reading.
36．The boy/ He is playing basketball now. 37．The girl/ She will fly a kite/ kites tomorrow. 38．The baby/ He/ She likes drinking milk. 39．There are two cups on the desk. 40．If it snows, the children/ we/ they will make a snowman/ snowmen.
41．The cat is enjoying/eating the fish now. 42．She is fond of playing the guitar. 43．It’s important to save water. 44．He was sweeping the floor at 7:00 pm yesterday. 45．Be careful when you cross the road.
46．The boy is feeling happy now. 47．The children are flying kites now. 48．A car is in front of the hospital. 49．The girl played the piano yesterday. 50．If they are free, they will have a big dinner.
51．Peter is shorter than Jim./Jim is taller than Peter. 52．He is cooking now. 53．The elephant is from Africa. 54．They played table tennis yesterday. 55．They will go for a picnic if the weather is fine.
56．They are planting a tree now. 57．She went to the park by bike yesterday. 58．The noodles taste delicious. 59．Amy runs fastest of all. 60．The box is so heavy that I can’t move it.
