Ranked by: number of candidates
1.
Preterite (regular verbs and irregular verbs) (1139 candidates) 
2.
Ser or estar (867 candidates)
3.
Imperfect (852 candidates)
4.
Present (790 candidates)
5.
Por or Para (496 candidates)
6.
Direct and indirect pronouns (491 candidates) 
7.
Imperative mood (affirmative and negative commands) (455 candidates)
8.
Present perfect: irregular verbs (426 candidates)
9.
Subjunctive (regular and irregular verbs) (415 candidates)
10.
Prepositions (372 candidates) 
11.
Present subjunctive (361 candidates) 
12.
Tan, tanto/-a/-os/-as (339 candidates) 
13.
Reflexive pronouns (337 candidates)
14.
"Antes" or "Después" (287 candidates) 
15.
If clauses (unreal conditional sentences) (266 candidates) 
16.
Present tense (245 candidates)
17.
Todavía or ya (214 candidates) 
18.
Indicative or subjunctive (212 candidates) 
19.
Prepositions (199 candidates)
20.
Salir or Sacar (177 candidates) 
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