Ranked by: number of candidates
1.
Express the future (186196 candidates)
2.
At the airport (125733 candidates) 
3.
Past tenses (122289 candidates)
4.
Question tags (93320 candidates)
5.
Much or many (78694 candidates)
6.
Present perfect (62317 candidates)
7.
Article 'the' / nothing (61689 candidates)
8.
Prepositions of time (61403 candidates)
9.
Present (56966 candidates)
10.
Plural (55101 candidates)
11.
Clothes (48979 candidates)
12.
Structure of the sentence (41203 candidates)
13.
Future (40425 candidates)
14.
At the police station (36450 candidates)
15.
Pronouns: one/ones (32914 candidates)
16.
Adverbs of manner (32693 candidates) 
17.
Comparative of superiority (32169 candidates)
18.
At the hospital (30133 candidates)
19.
Adverbs of frequency (27861 candidates) 
20.
Imperative (25749 candidates) 
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