CONTENTS 1
Lesson One 1
Exercises：Ⅰ． 1
Ⅱ． 3
Ⅲ． 3
Key to Exercises 3
Lesson Two 5
Exercises：Ⅰ． 5
Ⅱ． 7
Ⅲ． 7
Ⅳ． 7
Key to Exercises 8
Lesson Three 10
Exercises：Ⅰ． 10
Ⅱ． 12
Ⅲ． 12
Key to Exercises 12
Lesson Four 14
Exercises：Ⅰ． 14
Ⅱ． 15
Ⅲ． 17
Key to Exercises 17
Exercises：Ⅰ． 19
Lesson Five 19
Ⅱ． 21
Ⅲ． 21
Key to Exercises 22
Lesson Six 24
Exercises：Ⅰ． 24
Ⅱ． 26
Key to Exercises 27
Lesson Seven 30
Exercises：Ⅰ． 30
Key to Exercises 32
Ⅱ． 32
Lesson Eight 33
Exercises：Ⅰ． 33
Ⅱ． 35
Ⅲ． 35
Key to Exercises 35
Lesson Nine 36
Exercises：Ⅰ． 36
Ⅱ． 38
Key to Exercises 39
Lesson Ten 40
Exercises：Ⅰ． 40
Ⅱ． 42
Key to Exercises 43
Ⅲ． 43
Lesson Eleven 45
Exercises：Ⅰ． 45
Ⅱ． 47
Ⅲ． 47
Key to Exercises 48
Lesson Twelve 49
Exercises：Ⅰ． 49
Ⅱ． 51
Key to Exercises 52
Exercises：Ⅰ． 53
Lesson Thirteen 53
Ⅱ． 55
Ⅲ． 56
Key to Exercises 56
Lesson Fourteen 57
Exercises：Ⅰ． 57
Ⅱ． 59
Ⅲ． 59
Key toExercises 60
Lesson Fifteen 61
Exercises：Ⅰ． 61
Ⅱ． 63
Key to Exercises 64
Lesson Sixteen 65
Exercises：Ⅰ． 65
Ⅱ． 67
Key to Exercises 68
Lesson Seventeen 70
Exercises：Ⅰ． 70
Ⅱ． 72
Key to Exercises 73
Lesson Eighteen 74
Exercises：Ⅰ． 74
Ⅱ． 76
Key to Exercises 77
Lesson Nineteen 78
Exercises：Ⅰ． 78
Ⅱ． 80
Key to Exercises 80
Lesson Twenty 82
Exercises：Ⅰ． 82
Ⅱ． 84
Key to Exercises 86
附录一 带逻辑主语的非谓语动词结构 87
附录二 英语句子中词语的分隔和关联 93