Ranked by: number of candidates
1.
Pretérito indefinido: irregular (348703 candidates)
2.
Verbos con diptongación (177605 candidates)
3.
Soler + infinitive (157704 candidates)
4.
Gustar, doler, encantar ... (157330 candidates) 
5.
El pretérito perfecto compuesto (136835 candidates)
6.
Comparison : tan..como, tanto ..como, tanto/a/os/as..como (102987 candidates)
7.
Imperfect (102884 candidates)
8.
Adjectives agreement (100512 candidates)
9.
Gerund (92132 candidates)
10.
Present (80939 candidates)
11.
Present (64031 candidates)
12.
Animals (60273 candidates)
13.
Conditional - SI + sequence of tenses (59150 candidates) 

14.
Pretérito Indefinido. Verbs in -ZAR, -CAR, -GAR (57470 candidates) 
15.
Colours (53744 candidates)
16.
Do some shopping (49914 candidates)
17.
Pretérito indefinido (46558 candidates) 
18.
VERBOS DE CAMBIO (45580 candidates) 
19.
What the weather like? (45065 candidates)
20.
Pero .?.../...sino...? (43311 candidates) 
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