Base Difficulty

Base difficulty: Level 9 edit

Level distribution for adverb (relative_time): 6: 3 9: 3 22: 5 225: 9 1030: 1 1399: 4

Per-Language Difficulty Overrides

No difficulty overrides set. The base difficulty level will be used for all languages.

Add Difficulty Override
-1 to exclude, 1-1399 for level
Frequency and Tier Signals
Combined Frequency Rank: 81 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600
cambridge_yle Movers (2 of 3) 750
cefr A1 (1 of 6) 800

Rank used = synthetic rank this tier contributes to the combined frequency rank (lower = more common).

Corpus Frequency
Corpus Freq (per M) Best form Share Zipf rank Forms
19th_books 2584.00 53 100% 53 1
20th_books 2707.70 52 100% 52 1
wiki_math 2856.03 38 100% 38 1
wiki_geography 639.28 164 100% 164 1
wiki_biology 782.23 123 100% 123 1
wiki_modern_life 937.12 90 100% 90 1
wiki_arts 805.78 117 100% 117 1
wiki_society 727.92 125 100% 125 1
wiki_linguistics 505.18 240 100% 240 1
wiki_physical_science 971.41 94 100% 94 1
wiki_history 1066.36 81 100% 81 1
early_modern_science 1764.40 66 100% 66 1
religious_translated 2671.20 53 100% 53 1
cooking 5906.85 17 100% 17 1
legal_scotus 684.26 146 100% 146 1
eu_parliament_debates 728.92 173 100% 173 1
openstax_science 1201.50 77 100% 77 1
openstax_society 982.57 104 100% 104 1
wpa_life_histories 2744.04 50 100% 50 1

Best form = the single best-ranked form in the corpus, share-blind — how the spelling itself ranked. Share = how much of that spelling belongs to this lemma, when several senses compete for it. Zipf rank = all the forms combined (variant spellings included), each scaled by its share, and what feeds the combined frequency rank. Combining forms improves on the best form, but a share below 100% pushes the other way and usually wins: a sense holding a small slice of a common spelling is a rare word, so its rank lands downrated below the best form — and once it falls past what the corpus can support it is capped at the rank an unlisted word would get.