This is a long section with a lively story which introduces several important items of grammar, the dative case (GE pp. 176–180, #189–190), the aorist infinitive (GE pp. 187–189, #195–197), the aorist imperative (GE pp. 189–191, #198–200), γιγνώσκω (GE p. 201, #209), and the principal parts of common and very irregular verbs (GE p. 202, #211). None of this is difficult, but it pays to learn the new grammar carefully after each section in which it is introduced.
Before you start you may like to look at the table (GE pp. 176–177, #103) where the forms of the dative are set out. Notice the predominance of ι:
in -ᾳ -ῃ -ῳ -ι -ει in the singular
in -αις -οις -σι in the plural
The various uses of the dative are well described in GE pp. 179–180, #190.
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10 τί βουλόμενος As before, ‘wanting what, do you …?’ ἀπολεῖς με … ‘you will destroy me’, ‘you will be the death of me’. The future of ἀπόλλυμι.
11 βοῆ χρῶμαι χράομαι (‘I use’) takes the dative (GE p.180, #190 (e)). The meaning is the same as if βοῶ had been written.
17 ἐμπεσεῖται Future of ἐμπίπτω – πίπτωῦμαι ἕπεσον.
18 τυγχάνεις εἰδώς εἰδως -ότος is the participle of οἶ the infinitive is εἰδέναι.
20 οὑτοιί οῦτος αὕτη τοῦτο + ι is even more demonstrative. ‘These spectators here’. (Note that the neuter is τουτί ταυτί.)