Ranked by: number of candidates
1.
Pretérito indefinido (170108 candidates) 
2.
Days, months and seasons (104504 candidates)
3.
What time is it? (84506 candidates)
4.
Plural (81450 candidates)
5.
C / Z (59995 candidates)
6.
Clothes (49235 candidates)
7.
In the house (40062 candidates)
8.
Pretérito perfecto (37936 candidates)
9.
Interrogative pronouns, adverbs and adjectives (25183 candidates) 
10.
Present (regular verbs) (22164 candidates)
11.
Trades (13303 candidates)
12.
Present (12755 candidates)
13.
B / V (12272 candidates)
14.
Shops (11970 candidates)
15.
Plu perfect (11965 candidates)
16.
Telephone - vocabulary (10333 candidates) 
17.
Pretérito imperfecto (9380 candidates)
18.
Accents (9292 candidates) 
19.
LL / Y (9017 candidates)
20.
Asking questions (8711 candidates)
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