... PEG chapter 33 99 Infinitive used to express purpose 10 0 Clauses and phrases of purpose Keys to Practical Exercises 10 9 10 9 11 1 11 1 11 2 11 3 11 4 11 5 11 6 11 7 11 8 12 0 5 Exercises 1 Articles Articles: ... 1 A PRACTICAL ENGLISH GRAMMAR EXERCISES 1 CONTENTS Articles PEG chapter I 1 Articles: a/ an 2 Articles: the 3 Articles: a/ an, the 4 Articles and possessive adjectives 5 a/ an and one Auxiliary ... verbs PEG chapters 1 0 -1 6 6 Auxiliary verbs 7 Auxiliaries conjugated with do/does/did 8 Auxiliary verbs 9 Auxiliary verbs 10 Additions to remarks, using auxiliary verbs 11 Agreements and disagreements...