Ranked by: number of candidates
1.
A - An - The (1908 candidates)
2.
Question tags (1899 candidates) 
3.
Future - mixed tenses (1525 candidates) 

4.
Possessive adjectives or pronouns (1484 candidates)
5.
Money verbs (1225 candidates) 
6.
And - Because - But (1164 candidates)
7.
Adjectives or Adverbs (1162 candidates)
8.
Relative clause -1 (1105 candidates) 
9.
Prepositions At - In - On (1074 candidates)
10.
Much - Many (1014 candidates) 
11.
Adverbs of quantity (953 candidates) 
12.
Adverbs (905 candidates) 
13.
Pronouns -who - which (865 candidates)
14.
For-since-ago (855 candidates)
15.
Comparative - Superlative (813 candidates)
16.
Future - mixed tenses (765 candidates) 
17.
Adverbs in frequency (750 candidates) 
18.
Conjunctions-1 (717 candidates) 
19.
No or Not (708 candidates)
20.
Future continuous or future perfect (702 candidates) 
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