Questions & Answers about Ég held ekki fast í reipið þegar það er blautt.
Halda is the infinitive, meaning to hold. After ég you need the present-tense form for I, which is held.
So:
að halda = to hold
ég held = I hold
This verb is irregular, so the vowel changes from a to e.
Because Icelandic main clauses usually follow the verb-second rule.
In this sentence:
Ég = first element
held = finite verb, so it comes second
ekki = comes after that
So Ég held ekki ... is the normal order.
If another element came first, the verb would still stay in second position, for example:
Þegar það er blautt held ég ekki fast í reipið.