Ranked by: number of candidates
1.
A - An - The (1949 candidates)
2.
Question tags (1944 candidates) 
3.
Future - mixed tenses (1550 candidates) 

4.
Possessive adjectives or pronouns (1490 candidates)
5.
Money verbs (1241 candidates) 
6.
And - Because - But (1200 candidates)
7.
Adjectives or Adverbs (1173 candidates)
8.
Relative clause -1 (1128 candidates) 
9.
Prepositions At - In - On (1082 candidates)
10.
Much - Many (1016 candidates) 
11.
Adverbs of quantity (976 candidates) 
12.
Adverbs (912 candidates) 
13.
Pronouns -who - which (884 candidates)
14.
For-since-ago (858 candidates)
15.
Comparative - Superlative (823 candidates)
16.
Future - mixed tenses (790 candidates) 
17.
Conjunctions-1 (755 candidates) 
18.
Adverbs in frequency (755 candidates) 
19.
No or Not (726 candidates)
20.
Future continuous or future perfect (714 candidates) 
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