Ranked by: number of candidates
1.
Pretérito indefinido (178323 candidates) 
2.
Days, months and seasons (105294 candidates)
3.
What time is it? (85356 candidates)
4.
Plural (82112 candidates)
5.
C / Z (60767 candidates)
6.
Clothes (49534 candidates)
7.
In the house (40535 candidates)
8.
Pretérito perfecto (38467 candidates)
9.
Interrogative pronouns, adverbs and adjectives (25505 candidates) 
10.
Present (regular verbs) (22644 candidates)
11.
Trades (13416 candidates)
12.
Present (12907 candidates)
13.
Plu perfect (12400 candidates)
14.
B / V (12312 candidates)
15.
Shops (12056 candidates)
16.
Telephone - vocabulary (10369 candidates) 
17.
Pretérito imperfecto (9486 candidates)
18.
Accents (9450 candidates) 
19.
LL / Y (9037 candidates)
20.
Asking questions (8777 candidates)
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