Ranked by: number of candidates
1.
Preterite (regular verbs and irregular verbs) (1160 candidates) 
2.
Imperfect (921 candidates)
3.
Ser or estar (872 candidates)
4.
Present (799 candidates)
5.
Por or Para (599 candidates)
6.
Direct and indirect pronouns (508 candidates) 
7.
Present perfect: irregular verbs (478 candidates)
8.
Imperative mood (affirmative and negative commands) (463 candidates)
9.
Subjunctive (regular and irregular verbs) (443 candidates)
10.
Prepositions (424 candidates) 
11.
Family relationships (414 candidates)
12.
Present subjunctive (404 candidates) 
13.
Reflexive pronouns (367 candidates)
14.
"Antes" or "Después" (367 candidates) 
15.
Tan, tanto/-a/-os/-as (366 candidates) 
16.
Todavía or ya (359 candidates) 
17.
Antonyms (320 candidates)
18.
Present tense (297 candidates)
19.
Indicative or subjunctive (290 candidates) 
20.
If clauses (unreal conditional sentences) (287 candidates) 
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