41,burnt / cooked 

42,were crossing / shouted

43,were you doing 

44,had already gone / came 

45,had ever seen 

46,did you do 

47,went / were having 

48,won 

49,won't rain / start 

50,will wait / get 

51,happened 

52,moved

53,was / was walking / heard / followed / started 

54,has bought 

55,have crowded / arrived 

56,were playing 

57,Did you see / haven't seen 

58,have just received 

59,came / is sitting / watching / looks 

60,have ever met 

#good_luck 

@Bơ

41. Mary (burn) burned her hand yesterday when she (cook)  cooking the dinner.

42. While we (cross) crossing the street, the policeman (shout) shout at us last week.

43. What did you (do) do  at this time yesterday ?

44. He (already / go) had already gone before I (come) came  there.

45. It was the first time I (ever / see)had ever seen such a beautiful.

.46. What did you (do) do  yesterday ?

47. The light (go)went   out while we (have) were having  dinner.

48. He (win) won the gold medal in 2004.

49. I hope it (not rain)doesn't rain  when we (start)start  early tomorrow.

50. We (wait) wait right here until you (get) get back.

51. What (happen) happened  to you yesterday ?

52. Galileo proved that the Earth (move) moves around the sun.

53. I (be) was in the countryside with my grandfather some weeks ago. One night I(walk) walking along the country road when I suddenly (hear)heard footstepsbehind me. Somebody (follow)followed  me. Then I (start) started  to run.

54. He (buy)has bought   a new car recently.

55. The soccer fans (crowd) have crowded into the stadium since we (arrive) arrived 10minutes ago.

56. They (play) played tennis at 10:30 yesterday morning.

57. Did you (see) meet Nam yesterday ?

– Oh, no I (not see) haven't seen  him for along time.

58. I (just / receive) just received  Nga’s letter.

59. Mary (come) came back a moment ago. Now she (sit) sits on the sofa in theliving room and (watch) watches TV. She (look) looks a bit tired.

60. I think she is the nicest person I (ever / meet) ever met