Ranked by: number of candidates
1.
Pretérito indefinido (176802 candidates) 
2.
Days, months and seasons (104927 candidates)
3.
What time is it? (85144 candidates)
4.
Plural (81900 candidates)
5.
C / Z (60537 candidates)
6.
Clothes (49486 candidates)
7.
In the house (40419 candidates)
8.
Pretérito perfecto (38306 candidates)
9.
Interrogative pronouns, adverbs and adjectives (25303 candidates) 
10.
Present (regular verbs) (22226 candidates)
11.
Trades (13400 candidates)
12.
Present (12835 candidates)
13.
Plu perfect (12321 candidates)
14.
B / V (12286 candidates)
15.
Shops (12043 candidates)
16.
Telephone - vocabulary (10359 candidates) 
17.
Pretérito imperfecto (9463 candidates)
18.
Accents (9398 candidates) 
19.
LL / Y (9020 candidates)
20.
Asking questions (8752 candidates)
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