Syntactic Structure
Imperative — v. 7a
ἴσχυε οὖν καὶ ἀνδρίζου — So then be strong! Man up! (present imperatives 2sg)
↳ Ellipsis
...vv. 7b–7c omitted (to guard and do as Moses commanded; not turning right or left)
Clause 1 — Verb
καὶ οὐκ ἀποστήσεται — and shall not depart (future middle indicative 3sg)
↳ Subject
ἡ βίβλος τοῦ νόμου τούτου — the book of this law
↳ Separation
ἐκ τοῦ στόματός σου — from your mouth
Clause 2 — Verb
καὶ μελετήσεις ἐν αὐτῷ — and you shall meditate in it (future active indicative 2sg)
↳ Time
ἡμέρας καὶ νυκτός — day and night
ἵνα Clause
so that you may understand to do all the things written
↳ Main verb
συνῇς — you might understand (present active subjunctive 2sg, συνίημι)
↳ Complement
ποιεῖν — to do (present active infinitive, object of συνῇς)
↳ Object
πάντα τὰ γεγραμμένα — all the things having been written (perfect passive participle)
Present Active Indicative of λύω (Thematic Verb)
For each form, the structure is:
- present stem:
λύ‑
- thematic vowel:
ε or ο
- personal ending
- → surface form
1st singular
- present stem:
λύ‑
- thematic vowel:
ε
- personal ending:
‑ω
- →
λύ‑ + ε + ω = λύω
2nd singular
- present stem:
λύ‑
- thematic vowel:
ε
- personal ending:
‑ς
- →
λύ‑ + ε + ς = λύεις
3rd singular
- present stem:
λύ‑
- thematic vowel:
ε
- personal ending:
‑ι
- →
λύ‑ + ε + ι = λύει
1st plural
- present stem:
λύ‑
- thematic vowel:
ο
- personal ending:
‑μεν
- →
λύ‑ + ο + μεν = λύομεν
2nd plural
- present stem:
λύ‑
- thematic vowel:
ε
- personal ending:
‑τε
- →
λύ‑ + ε + τε = λύετε
3rd plural
- present stem:
λύ‑
- thematic vowel:
ο
- personal ending:
‑σι(ν)
- →
λύ‑ + ο + σι(ν) = λύουσι(ν)
In every case, the thematic vowel is present between the stem and the personal ending;
in the singular it is usually ε,
in 1st–3rd plural ο,
and then contracted or fused into the surface form.