... PurposePEG chapter 3399 Infinitive used to express purpose 10 0 Clauses and phrases of purposeKeys 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 05You . . . (speak) slowly. ... Auxiliaries conjugated with do/does/did PEG 10 6-7, 12 3, 12 6 (see also Exercise 17 )Some auxiliaries when used in certain ways make their negative and interrogative 13 A PRACTICAL ENGLISH GRAMMAR EXERCISES ... 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...