Ranked by: number of candidates
1.
Adjectives and adverbs (2333 candidates) 
2.
Instead of, unlike or whereas (1435 candidates) 
3.
Stop to do sth or stop doing sth (1323 candidates)
4.
Infinitive or ing-form after verbs of perception (1216 candidates) 
5.
Past modals with deduction (1203 candidates) 

6.
Above or over (1077 candidates)
7.
Make sb do sth or have something done (1007 candidates) 
8.
Word order: Verbs and objects go together (995 candidates)
9.
Forget, remember, stop, be sorry + gerund or infinitive (824 candidates) 
10.
Had better or should (797 candidates) 
11.
Prepositions at, in, on (778 candidates)
12.
Word order: Place before time (723 candidates)
13.
Find the opposite adjective! (722 candidates) 
14.
Let alone (689 candidates)
15.
Inverted conditionals (689 candidates) 

16.
All of which, whom, none of which, etc. (681 candidates) 
17.
Definitive, indefinite or no article (649 candidates)
18.
Go on - regret to do sth - doing sth (640 candidates) 
19.
Dismissive, defiant, brazen (632 candidates) 

20.
Remember to do sth / Remember doing sth (613 candidates) 
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