1.
Sequence of tenses (82 candidates) 
2.
Present => Preterite (Presente => Pretérito indefinido) (86 candidates) 

3.
Très, beaucoup (muy/mucho) (134 candidates) 
4.
Numbers (215 candidates)
5.
Imperative (68 candidates) 
6.
Gerund (100 candidates) 
7.
Present tense (290 candidates)
8.
Past participles (irregular) (186 candidates)
9.
Ser or Estar and right tense (289 candidates) 
10.
Por or Para (297 candidates) 
11.
Gender of nouns (315 candidates)
12.
Present perfect (372 candidates) 
13.
Diacritical accent (126 candidates) 
14.
Paronyms (100 candidates) 
15.
Prepositions (355 candidates)
16.
Present tense (irregular verbs) (462 candidates)
17.
Ser o Estar (261 candidates) 
18.
Past simple (irregular verbs) (801 candidates)
19.
Pronouns (54 candidates)
[Being reviewed]20.
Prepositions (598 candidates) 
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