Ranked by: number of candidates
1.
Express the future (186849 candidates) 

2.
At the airport (126281 candidates) 
3.
Past tenses (122749 candidates)
4.
Question tags (93553 candidates)
5.
Much or many (78906 candidates)
6.
Present perfect (62522 candidates)
7.
Article 'the' / nothing (62092 candidates)
8.
Prepositions of time (61415 candidates)
9.
Present (57253 candidates)
10.
Plural (55157 candidates)
11.
Clothes (49163 candidates)
12.
Structure of the sentence (41394 candidates)
13.
Future (40476 candidates)
14.
At the police station (36477 candidates)
15.
Pronouns: one/ones (32972 candidates)
16.
Adverbs of manner (32772 candidates) 
17.
Comparative of superiority (32386 candidates)
18.
At the hospital (30175 candidates)
19.
Adverbs of frequency (27965 candidates) 
20.
Imperative (25786 candidates) 
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