Unique rules when forming that grammar are highlighted like this
Example sentences follow these rules too!
Joining and Nesting Markers:
Verb[た/る] - means that dictionary form and ta form are accepted.
Verb[causative[て]] - means て form of the causative form of the verb.
Details
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使用域硬い
Information
(A) が早いか (B) is a formal written expression that is not often used in speech, meaning that as soon as (A) happens, (B). In other words, (B) happens directly after (A).
(B) is often surprising, spontaneous, or habitual and usually expresses someone’s actions (行く、駆け出す）. Due to this, it is uncommon with expressions that are beyond human control, like 雨が降った.
The following phrase is always in the past tense, so it cannot be used to express future intentions with volitional form or expressions like つもり.
It is also not used when talking about speaker/writer, however, the subjects of (A) and (B) might differ.