Ranked by: number of candidates
1.
A - An - The (1958 candidates)
2.
Question tags (1957 candidates) 
3.
Future - mixed tenses (1561 candidates) 

4.
Possessive adjectives or pronouns (1495 candidates)
5.
Money verbs (1244 candidates) 
6.
And - Because - But (1210 candidates)
7.
Adjectives or Adverbs (1173 candidates)
8.
Relative clause -1 (1141 candidates) 
9.
Prepositions At - In - On (1082 candidates)
10.
Much - Many (1016 candidates) 
11.
Adverbs of quantity (981 candidates) 
12.
Adverbs (913 candidates) 
13.
Pronouns -who - which (893 candidates)
14.
For-since-ago (860 candidates)
15.
Comparative - Superlative (828 candidates)
16.
Future - mixed tenses (799 candidates) 
17.
Conjunctions-1 (761 candidates) 
18.
Adverbs in frequency (756 candidates) 
19.
No or Not (730 candidates)
20.
Future continuous or future perfect (721 candidates) 
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